Chapter 1: Animal Communication

CHAPTER 1 ANIMAL COMMUNICATION

hen Darwin presented his explanation of how living things evolve, he challenged the belief that human beings have a very special, indeed unique place in the universe. Since his time, people have searched for proof of their superiority to other animals. This search has usually focused on the powers of the large human brain, and especially on the ability to use language. “All animal can communicate, but only human beings have language” is a statement that has been made repeatedly in the twentieth century.

This claim raises a host of questions. What, for example, is communication, and how does animal communication differ from human communication? What makes language different from the cries of birds? Can be taught a language?—and, if so, what does that say about apes and about humans? By looking first at the nature of communication and then at how animals communicate, we can clarify what language is and why the ability to use language is very significant in defining human nature

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Communication and Animals From many legends and folktales, we heard about someone’s extraordinary ability to talk with animals. Sometimes, not only human can talk with animals but animals can talk back to him. Even, many of us, as adults, are still convinced that we can talk with animals, particularly with our pets. “When I tell Kitty to get off the kitchen table, she does.” “Three meows mean hungry.” While we certainly able to communicate with our pets, the question arises as to whether we actually “talk with” them.

To consider what “talk with” means, we need to consider what communication is by studying the Message Model. According to this model, communication is a process in which information is transmitted from a source – to sender – to a goal –the receiver, as shown in figure 1 as follows:

Figure 1 Process of Communication

SENDER CHANNEL RECEIVER MESSAGE SOURCE SIGNAL GOAL

THE MESSAGE MODEL

Source: Mc Manis et al. (1987: 15)

According the Message Model above, a communicator, the sender, thinks up some information at the source, then transmits that information through a signal. The receiver picks up the signal at the message destination and decodes it. The sender and the receiver can exchange positions, and the signal can be manifested in a variety of forms: chemical emission, gesture, sound, etc.

On a more technical level, “talk with” means that we have a sender and a receiver and we exchange messages through he medium of sound, more specifically language. When we communicate with our pets, we really do not talk with them as they do not use language to communicate messages back to us, and they may not even function as a sender at all.

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According to the above model, the communication process involves five steps: 1. Encoding the information into a symbolic system. All communication uses signals or symbols. If a person wants to transmit the information “I am thirsty.” He or she must put that information into the symbolic system of language—in this case, English. 2. Selecting a mode of communication. Next, he or she may choose to verbalize this message, as opposed to writing it or miming it. 3. Delivering the symbols through medium. A medium is the physical basis fro communication, for example light, air, or ink. In this case, the medium is the air which conveys the sound waves of a verbalized message. 4. Perceptual processing of the symbols by the receiver. If the communication is to occur, a receiver must perceive the symbols; the receiver must see or hear or feel the symbols sent. In this example, the human ear receives the sound waves. 5. Decoding of the symbols to obtain the information. Even if the receiver perceives the symbols, nothing is communicated unless the receiver is able to decode the message contained in the sound waves. One assumes that the receiver knows the individual words and grammar of the language, and thus comprehends the message. According to this definition of communication, how do we know when communication has taken place? This question might arise even when considering human communication, but it is especially interesting— and perplexing— when it concerns animal communication. Most animals possess some kind of “signaling” communication system. For examples:

Spiders Among the spiders there is a complex system for courtship. The male spider, before he approaches his lady love, goes through elaborate gestures to inform her he is indeed a spider and not a crumb or a fly to be eaten. These gestures are invariant. One never finds a “creative” spider changing or adding to particular courtship ritual of his species.

Fiddle Crabs A similar kind of “gesture” language is found among the fiddler crabs. There are forty different varieties, and each species uses its own particular “claw-waving” movement to signal to another member of

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its “clan.” The timing, movement, and posture of the body never change from one time to another within the particular species. Whatever the signal means, it is fixed. Only one meaning can be conveyed. There is not an infinite set of fiddler crab “sentence.” Nor can the signal be “broken down” into smaller elements, as is possible in any utterance of human language.

Dogs Let us say we observe two dogs being walked in opposite directions. As they approach and then pass, one, a Pekinese, gives out a fury of yaps with much straining at his leash; the other, a larger nondescript pooch, looks at the yapping Pekinese but otherwise does not respond. Has communication occurred? Even if we stipulate that the Pekinese’s noises are intended as communication—that they do encode some types of information—we cannot then assume that communication has occurred; for communication requires that the goal or the pooch has done so?

Swans Let us say there are two swans—A and B. If swan A ruffles its tail feathers and swan B promptly dives, then it seems reasonable to consider the question of what the ruffling of feathers by a swan “says” to another swan. We are not obliged to conclude that this behavior is communicative: in fact, such a conclusion on the basis of one observation would be unwarranted. If, however, we observe time after time that when one swan ruffles its feathers, another swan dives, then the hypothesis that ruffling of feathers by swans in a communicative event becomes increasingly attractive.

Honeybees Establishing such a connection between the behavior of one animal and another, however, is far from easy. Karl von Frisch’s studies (1950, 1967) of communication among bees provide a model of how such relationships can be studied. Von Frisch sent decades of his life observing the behavior of bees. Eventually, he came to suspect that certain bee behavior is communicative. To study this behavior, he carefully organized the environment of his bees to elicit the same behavior repeatedly and to evaluate the response of other bees. He established a new source of nectar within the foraging radius of his

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bee hive and waited for a bee to discover it. After finding the nectar, the bee would return to the hive and go into the “dance.” As an apparent result, other bees would then fly directly to the new source of nectar. This sequence of events happened often enough to permit the tentative conclusion that there was something about the bee’s dance that communicated the location of the source of the nectar.

The “language” of the honeybees is far more complex. It is observed through their dances. The dancing behavior may assume one of three possible patterns: round, sickle, and tail-wagging . The determining factor in the choice of dance pattern is the distance of the food source from the hive. The round dance indicates location near the hive, within twenty feet or so. The sickle dance indicates locations at an intermediate distance from the hive, approximately twenty to sixty feet. The tail-wagging dance is for distances that exceed sixty feet or so. The number of repetitions per minute of the basic pattern in the tail-wagging dance indicates the precise distance; the slower the repetition rate, the longer the distance.

The bees’ dance is an effective system of communication for bees. It is capable, in principle, of infinitely many different messages, like human language; but unlike human language, the system is confined to a single subject—distance from the hive. The inflexibility was shown by an experimenter who forced a bee to walk to the food source. When the bee returned to the hive, it indicated distance twenty-five times farther away than the food source actually was. The bee had no way of communicating the special circumstances in its message. This absence of creativity makes the bees dance qualitatively different from human language.

Dolphin and Whales Dolphin and whales are marine animals. They have ability to make an incredible variety of sound—far more than any other animal, including humans can make. Their low-pitched sounds are believed to function as cetacean sonar; that is, like bats they use echoes to locate objects and to navigate. But even if we subtract these low-pitched sounds, the inventory of sounds that cetaceans might use for communication is staggering. The impulse to conclude that they do communicate with these sounds is very nearly overwhelming. As oceanographer Jacques Cousteau (1972) put it: “My friend and I have perhaps spent too much time with whales; we may be the victims of

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an illusion. But how can we explain these alternating voices, and such a diversity of modulation, except by concluding that is actually conversation?” No direct evidence that communication is involved has been found; the conclusion that cetaceans communicate is defended instead by asking, what else can these sounds be? For now, at least, scientists can say little more than this about many forms of animal behavior.

Birds The imitative sounds of talking birds have little in common with human language, but the calls and songs of many species of birds do have communicative function, and they resemble human language in that there may be “dialects” within the same species. Bird calls (more complex patterns of notes) convey messages associated with the immediate environment, such as danger, feeding, nesting, flocking, and so on. Bird songs (more complex patterns of notes) are used to “stake out” territory and to attract mates. There is no evidence of any internal structure to these songs, nor can they be segmented into independently meaningful parts as words of human language can be. In a study of the territorial song of the alternation between high- pitched and low-pitched notes, and which came first did not matter. The message varies only to the extent of how strongly the robin feels about his possession and to what extent he is prepared to defend it and start a family in that territory. The different alternations therefore express “intensity” and nothing more. The robin is creative in his ability to sing the same thing in many different ways, but not creative in his ability to use the same “unit” of the system to express many different messages with different meanings.

“Talking” Parrot “Talking” birds such as parrots and mynah birds are capable faithfully reproducing words and phrases of human language that they have heard; but when a parrot says “Polly wants cracker,” she may really want a sandwich or drink of water or nothing at all. A bird that has learned to say “hello” or “goodbye” is as likely to use one as the other, regardless of whether people are arriving or departing. The bird’s utterances carry no meaning. They are speaking neither English nor their own language when they sound like us.

Talking birds do not dissect the sounds of their imitations into discrete units. Polly and Molly do not rhyme for a parrot. They are as different

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as hello and goodbye (or as similar). A Parrot says what it is taught, or what it hears, and no more. If Polly learns “Polly wants a cracker” and “Polly wants a doughnut” and also learns to imitate the single word whiskey and bagel , she will not spontaneously produce, as children do, “Polly wants whiskey” or “Polly wants a bagel” or “Polly wants whiskey and a bagel.” If she learns cat and cats and then learns the word parrot , she will be unable to form the plural parrots ; nor can a parrot form unlimited set of utterances from a finite set of units. Therefore, the ability to produce sounds similar to those used in human language cannot be equated with the ability to learn a human language.

Chimpanzees According to a number of psychologists’ reports, more than a dozen chimps, two and an have learned extensive vocabularies in one or another visual language. Even more intriguing are claims that the apes have mastered a fundamental aspect of human language: the ability to create sentence. - : In 1930s, two scientists (Luella and Winthrop Kellogg) reported on their experience of raising an infant together with their baby son. The chimpanzee, called Gua, was reported to be able to understand about a hundred words, but didn’t say any of them. - : In the 1940s, a chimpanzee named Viki was reared by another scientist couple (Catherine and Keith Hayes) in their own home, exactly as if she was a human child. These foster parents spent five years attempting to get Viki to ‘say’ English words by trying to shape her mouth as she produced sounds. Viki eventually managed to produce some words, rather poorly articulated versions of mama, papa, and cup . In restrospect, this was remarkable achievement since it has become clear that non-human do not actually have a physically structured vocal tract which is suitable for articulating the sounds used in speech. Apes and gorillas can, like , communicate with a wide range of vocal calls, but they just can’t make human speech sounds. - : Another scientist couple (Beatrix and Allen Gardner) set out to teach a female chimpanzee called Washoe to use a version of American Sign Language. This sign language has all the essential properties of human language and is learned by many congenitally deaf children as their natural first language. From the beginning, the Gradners and their research assistants raised Washoe like a

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human child in a comfortable domestic environment. Sign language was always used when Washoe was around and she was encouraged to use signs, even her own incomplete ‘baby-versions” of the signs used by adults. In a period of three and a half years, Washoe came to use signs for more than a hundred words, ranging from airplane, baby, and banana trough to window , woman and you . Even more impressive was Washoe’s ability to tke these forms and combine them to produce ‘sentence’ of the type gimme tickle, more fruit and open food drink (to get someone to open refrigerator). Some of the forms appear to have been inventions by Washoe, as in her novel sign for bib and in the combination water bird (referring to a swan), which would seem to indicate that her communication system had the potential for productivity. Washoe also demonstrated understanding of a much larger number of signs that she produced and was capable of holding rudimentary conversation, mainly in the form of question-answer sequences. A similar conversation ability with sign language was reported (by Francine Patterson) for a named not long after.

- Sara and : At the same time as Washoe was learning sign language, another chimpanzee named was being taught (by Ann and David Premack) to use a set of plastic shapes for the purpose of communicating with humans. These plastic shapes represented ‘words’ that could be arranged in sequence to build ‘sentences’ (Sarah preferred a vertical order). The basic approach was quite different from that of the Gardners. Sarah was systematically trained to associate these shapes with objects or actions. She remained an animal in a cage, being trained with food reward s to manipulate a set of symbols. Once she had learned to use a large number of these plastic shapes, Sarah was capable of getting an apple by selecting the correct plastic shape (a blue triangle) from a large array. Notice that this symbol is arbitrary since it would be hard to argue for any ‘natural’ connection between an apple and a blue plastic triangle. Sarah was also capable of producing ‘sentences’ such as Mary give chocolate Sarah and had the impressive capacity to understand complex structures such as If Sarah put red on green, Mary give Sarah chocolate . Sarah got the chocolate.

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= Mary

= Give

= Chocolate

= Sarah

A similar training technique with another artificial language was used (by Duane Rumbaugh) to train a chimpanzee called Lana. The language she learned was called Yerkish and consisted of a set of symbols on a large keyboard linked to a computer. When Lana wanted some water, she had to press four symbols, in the correct sequence, to produce the message please machine give water .

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Both Sarah and Lana demonstrated an ability to use what look like word symbols and basic structures in ways that superficially resemble the use of language. There is, however, a lot of skepticism regarding these apparent linguistic skills. It has been pointed out that when Lana used the symbols for “please”, she did not have to understand the meaning of the English word please . The symbols for “please” on the computer keyboard might simply be the equivalent of button on a vending machine and, so the argument goes, we could learn to operate vending machines without necessarily knowing language. This is only one of the many arguments that have been presented against the idea

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that the use of sign and symbols by these chimpanzee is similar to the use of language. - : In a more recent study by Sue Savage-Rumbaugh, an interesting development relevant to this controversy came about almost by accident. While Savage-Rumbaugh was attempting to train a (a pygmy chimpanzee) called Matata how to use the symbols of Yerkish, Matata’s adopted baby, Kanzi, was always with her. Althoug Matata did not do very well, her son, Kanzi, spontaneously started using the symbols system with great ease. He had learned not by being taught, but by being exposed to, and observing, a kind of language in use at a very early age. Kanzi eventually developed a large symbol vocabulary (over 250 forms). By the age of eight, he was reported to be able, through the association of symbols with spoken words, to demonstrate understanding of spoken English at a level comparable to a two- and-a-half-year-old human child. There was also evidence that he was using a consistently distinct set of ‘gentle noises’ as words to refer to things such as bananas, grapes and juice. He had also become capable of using his symbols system to ask to watch his favorite movies, Quest for Fire (about primitive humans) and Greystoke (about the Tarzan legend).

Characteristics of Animal Communication Much has been learned, however, about many system of animal communication. A vast array of creatures has been observed— bees, dolphin, whales, birds and chimpanzee—and, not surprisingly, many types of communication have been found. In analyzing these varied systems and comparing them with human communication, two questions are especially interesting: What kinds of messages can particular animal convey, and are their systems of communication genetically set or learned?

The Message of Animals Many animal howl, twitter, or sing. Some birds even mimic human words and phrases. But what, if anything, are the saying? Lorenz (1952) noted the case of a parrot that surprised everyone by calling, appropriately, “The chimney sweep is coming!” But Lorenz denied that the bird knew what it was saying. The parrot, Papagallo by name,

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had a terrible fear of the chimney sweep; his visits were times of severe trauma for Papagallo, who learned to associate them with the cook’s cry. “The chimney sweep is coming.” If the cook had cried “The fat’s burning” at exactly those same instances, it may be presumed that this is what Papagallo would finally have said.

Like Papagallo, many animals vocalize in response to stress. Some cries and actions, however, have ore specific meanings that are conveyed to other members of the species. Scientists have been able to assign rough translations to many bird and mammal calls. The famed animal behaviorist Koendrad Lorenz (1952), for example, has discussed a number of calls of the jackdaw: the kia (“fly with me”), kiaw (“let’s go home”)

Animal Communication System: True Language? A basic question pondered at some time or other by all human language users is whether any other species also has a real language. Certainly other species have forms of communication, but “communication” is not synonymous with “language”. No known animal uses a language in the wild, but animals do communicate with each other is system called codes. A true language differs from a signal code in terms of several essential features.

Communication systems,—both human and animal communications-- have some features: 1. A Mode of Communication: The mode of communication may be vocal-auditory as in human and most animal systems, or visual as in sign language and many other animal systems (e.g. bees), or tactile, or even chemical (e.g. moths). 2. Semanticity: The signals in any communication system have meaning. Without this feature, the system would consist merely of noise (in the technical sense of a meaningless jumble). 3. Pragmatic Function: All systems of communication serve some useful purpose(s), from helping the species to stay alive to influencing others’ behavior in some way (as in TV commercials).

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Signal Codes Vs Language Some of the signal codes used by animals may exhibit one or more of the features describe above, but only to a limited degree. For example, the dance of the honeybees has limited displacement—it communicates information about the location of a distant food source seen in the recent past—and parts of the dance are arbitrary, though others are representational. The bee’s system is not completely productive since they cannot. For example, convey information about vertical distance or direction. Most signal codes consist of a small, finite number of discrete signals, often concerned with essentials of survival such as food, danger, or reproduction. These systems lack a mechanism for introducing new signals: they are closed communication systems. Thus when the animal is confronted with a novel situation, it has no way to communicate about situation (an obvious disadvantage for the best chances of survival).

Language, in contrast, must have all of the language features to be considered language. Without one or more, it would simply be a signal code.

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