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MAREN Gaulke Muhliusstrasse 84, 24103 Kiel 1, Germany Asiatic Research Vol. 6, I June 1995 Herpetolo^ical pp. WW Observations on Arboreality in a Philippine Blind Snake MAREN Gaulke Muhliusstrasse 84, 24103 Kiel 1, Germany Abstract. -Five blind snakes were observed in June 1990 in the rain forests of Sibutu Island in the Sulu Archipelago, Philippines. Contrary to the usually fossorial habits of typhlopids, Ramphotyphlops suluensis (Taylor, 1918) shows arboreal habits. It climbed through trees at night using the prehensile tail and hindbody. When caught they extruded a strong smelling liquid from their cloaca. Relatively long tails are found in some other rain forest dwelling typhlopids, which may also have arboreal habits. Key words: Reptilia, Ophidia, Typhlopidae, Ramphotyphlops suluensis, Philippines, ecology. and the relative humidity between 70 and Introduction 95%. Little is known of the behavior of blind The nomenclatural history and taxonomy snakes (Typhlopidae). Information is of the typhlopids observed and caught on normally generalized and consists of little Sibutu is discussed in Gaulke (in press), more than that typhlopids are small, where the species, previously synonymized burrowing snakes, which live in decaying with Ramphotyphlops olivaceus (Gray, logs, humus and leaf litter, and feed mainly 1845), is revalidated. Ramphotyphlops on ants and termites, especially their grubs, suluensis reaches a length of approximately pupae and eggs (e. g. Taylor, 1922; 40 cm, the eyes are distinctive, and the tail is Loveridge, 1946; Gruber, 1980). more than twice as long as broad. The dorsal side is gray, the ventral side is cream, This gap in observations is certainly due with bright white scales along the median to a number of different factors. Typhlopids row. are very inconspicuous and rather dull Observations looking, and as such, arouse the interest of few people, even among herpetologists. Although a considerable amount of time About 168 species are known (Hahn, was spent turning and splitting decaying 1980). Many are found infrequently, and logs, and digging in humus and leaf litter in often are known from one or a few search of blind snakes, all efforts were specimens only. Due to their size, unsuccessful. However, a few days before coloration, and secretive habits, they are I had to leave Sibutu Island, the luck turned. hard to observe. However, observations While looking for geckos with a flashlight reported here on a rain forest dwelling blind between 2200 and 0200 hours, the first snake in the Philippines, indicate that at least blind snake was observed, not on the not all of them are as secretive as generally ground as expected, but on a tree on an assumed. almost leafless twig approximately 3 m above the ground. While trying to reach it, Methods the disturbed animal let itself drop to the ground, and vanished into the leaf litter. In June 1990 a three week field survey During the following three nights, four more was conducted on Sibutu, a small island in specimens were observed, all on branches the Sulu-Archipelago, a few miles off the and twigs above my head. Being more northeast coast of Sabah, Borneo (04° careful now, it was quite easy to catch them. 46.4'N, 119° 28.8'E). Observations and All four reacted to the capture with the collections of amphibians and reptiles were excretion of a pungent musk from their made within a forested area (primary and cloaca, the stench of which adhered to the secondary lowland forest of the molave type skin for some time. sensu Dickerson, 1928). Short, but heavy, rains fell every two to three days, the Before capture, the mode of locomotion temperature ranged between 25 and 32°C, of the climbing blind snakes was observed © 1995 by Asiatic Herpetological Research Vol. 6, p. 46 Asiatic Herpetological Research June 1995 FIG. 1. Ramphotyphlops suluensis climbing in an avocado tree. FIG. 2. Ramphotyphlops suluensis making searching movements with its stiffened forepart while climbing. June 1995 Asiatic Herpetological Research Vol. 6, p. 47 for some time. While the tail and hindbody Discussion is tightly coiled around a twig, they crawl forward with the free part of their body. Characteristic features of typhlopid Depending on the thickness of the twig, they snakes are: a cylindrical body, smooth may use protrusions as resistance and hold, small scales throughout the entire body, a or make serpentine movements, with parts small narrow head with a solid cranium, a of their body hanging loosely down on both short broad tail ending in a sharp spine, and sides of the twig. After the forepart is reduced eyes covered by much larger scales. secured, the tail/body grip is released and These adaptations for fossorial life are in then dragged forward, and anchored further almost complete contrast to the along. Compared to typical arboreal snakes, characteristics of typical arboreal snakes, like whip snakes or flying snakes, they such as a laterally compressed or triangular move very slowly, but are nevertheless body, a thin prehensile tail, and medium skilled and effective climbers. During their sized to large eyes. However, as shown by movements, they stop relatively often and R. suluensis, it can be erroneous to interpret demonstrate a conspicuous behavior. While the mode of living from the habitus alone. the hind part is coiled in the tree, the Only the relatively longer tail compared to stiffened forepart is stretched into the air, other typhlopids (in most typhlopids the tail making slow circular movements. When is about as long as wide) might be they discover another twig or branch within interpreted as an adaptation towards their reach with this searching movements, arboreality. they might climb over to it. All the while are they are tongue flicking. (Fig. 1, 2). The question remains, why they climbing in trees, as the disadvantage is Two of the snakes captured were obvious. They are more exposed to preserved and transferred to the predation from nocturnal animals, such as Forschungsinstitut und Naturmuseum owls or cat snakes, than their relatives Senckenberg (SMF 74247/8). The stomach which only seldomly leave their burrows. of the larger snake (total length 357 mm, Few blind snakes were observed climbing weight 11.5 g) contained part of an on trees before. A Ramphotyphlops unidentified earthworm, with a surprisingly nigrescens was found 5 m above the ground in a tree large girth in relation to the tiny mouth of the (Shine and Webb, 1990), snake. The two other specimens were kept arboreality is discussed for R. braminus alive for further observation. They are (Swanson, 1981), and it is reported for strictly nocturnal. Larvae of the moth, some Leptotyphlopidae (Vanzolini, 1970). Galleria mellonella, were offered as food, Shine and Webb (1990) discuss arboreality but they were never observed feeding. in scolecophidians as a feeding strategy. Nonetheless, their good condition after They assume that there may be little several months in captivity indicated some difference for them to follow ant-trails food uptake. For video records they were underground or on trees. However, the placed on a small avocado tree during observations on R. suluensis indicate that daytime. Here the same movements could this species is not incidentally climbing up be observed and recorded, as described trees, but might be more or less specialized above. When released in the middle of the on an arboreal life. All specimens on Sibutu avocado stem, they more often climbed up were found climbing, and none on the than down, searching for a resting place ground. It can be assumed that R. suluensis within the branches. However, sometimes is not the only blind snake specialized on they climbed down and started to burrow arboreality. Taylor (1922) collected several of into the soil of the flower pot, proving that Philippine typhlopids in the root balls they are as effective in digging as in aerial ferns, on felled trees. He concluded within climbing. that they are living and hunting these root balls. I assume it is much more likely that they are using epiphytes, etc., only as daytime retreats, actively searching for food Vol. 6, p. 48 Asiatic Herpetological Research June 1995 in the twigs and branches of the tree during GEHLBACH, F. R., J. F. WATKINS, AND H. W. night time. Those blind snakes found in RENO. 1968. Blind snake defensive behavior ant attacks. Bioscience epiphytes have unusually long tails for elicited by 18:784-785. typhlopids, being four to seven times as G RUBER, U. 1980. Blindschlangen, long as broad. In view of the skilled way Wiihlschlangen und Warzenschlangen. Pp. 362-366 R. suluensis uses its much shorter tail for In B. Grzimek (Ed), Grzimeks Tierleben. Band 6. climbing, they should be even better Kriechtiere. Deutscher Taschenbuch Verlag, arboreal live. equipped for an Miinchen. The function of the cloacal sac HAHN, D. E. 1980. Liste der rezenten Amphibien substance, which R. suluensis used as a und Reptilien. Anomalepidae, Leptotyphlopidae, defense mechanism against capture, was Typhlopidae. Das Tierreich 101:1-93. Walter de investigated in the leptotyphlopid Gruyter, Berlin. Leptotyphylops dulcis. Gehlbach et al. LOVERIDGE, A. 1946. of the Pacific (1968) found that it repelled attacking army Reptiles world. Macmillan Co., New York. 259 ants, upon which these snakes feed. pp. Furthermore the substance was found to SHINE, R., AND J. K. WEBB. 1990. Natural repel sympatric ophiophagous and history of Australian typhlopid snakes. Journal of insectivorous snakes, a much more serious Herpetology 24(4):357-363. danger to the blind snakes. On the other hand, L. dulcis are attracted to their own SWANSON, S. 1981. Typhlina bramina, an colacal sac substance (Watkins et al., 1969), arboreal blind snake? Northern Territory Naturalist, so it has different functions, as interspecific Darwin, N.T. 4:13. repellent, and as intraspecific attraction. It E. H. 1922. The snakes of the can be assumed that it has similar complex TAYLOR, functions in R.
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