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Helpful Hawks Silhouettes That Save HH- 1 Helpful Hawks Topic Silhouettes that save Page ird feeders provide excellent opportunities fall unnoticed in shrubbery of be scavenged Bto watch our favorite birds “up close and by cats, crows and squirrels. In addition to personal.” Unfortunately, they also pose the dead bodies, there are other tell-tale marks risk of substantially increasing avian mortality. that can help you determine if your windows are killing birds such as a bit of blood or Increased risks to birds at bird feeders come feathers stuck on the pane. Another tell-tale in three forms, (1) natural and unnatural sign is a “bird angel”--the impression left on predation, (2) contagious diseases, and (3) the window by the birds feathers. Some bird window strikes. angels are so clear that they can be used to tell which species collided with the window. This activity is designed to help you reduce the risk of window strikes. Suggestions for Reducing window strikes reducing predation and contagious diseases at your feeders are provided at the end of One easy way to reduce window strikes near the activity. bird feeders is to place your feeders within a foot or two of your windows, or, alternatively, Window strikes pose a significant hazard to more than 20 feet from your windows. birds (see Facts about window strikes, Placing feeders close to windows reduces below). Your window may be killing birds even the risk of window strikes by reducing the if you don’t find any bird bodies, which can Facts about window strikes Gender, age, and whether the bird is a migrant or resident, appear to have little effect on a bird’s 25%, or 225 of 917 of all bird vulnerability to window strikes. species in the United States and Canada, are known to be killed by Window strikes occur in all habitats, striking windows. including urban, suburban, and rural neighborhoods. Tiny hummingbirds can be victims of window strikes, as can large hawks Windows of all sizes, heights, and and falcons. orientations kill birds, including windows in parked cars and phone Window strikes may kill as many 100 booths. million birds each year in North America alone. Birds strike windows because they view the reflective glass surfaces as Birds have been hitting windows in real habitats, or because they fail North America for over 150 years. to see the window at all. © 1998 Hawk Mountain Sanctuary HH- 2 Topic Helpful Hawks Page Silhouettes that save continued ... bird’s opportunity to develop sufficient by themselves. Their sizes can be increased momentum before striking the glass. Placing or decreased to suit your needs. feeders far from windows reduces risk by reducing the likelihood of window strikes, Commercially available silhouettes can be period. purchased at nature and bird-feeder stores as well as at the Sanctuary’s bookstore. Another way to reduce window strikes is to place netting over your windows. Hawk Rescuing window-strike birds Mountain Sanctuary uses this method to reduce window strikes at feeders at its Visitor Not all birds that strike windows are killed. Center. Should you see or hear a window strike, look for the bird underneath the window. If you Yet another way to reduce window strikes is see a dazed bird, bring it indoors and protect to place silhouettes of hawks on your it from predators—a darkened cardboard box windows. Hawk silhouettes help reduce with several holes punched in the side works window strikes for two reasons. First, well. Do not attempt to give the bird any food silhouettes work because feeder birds fear or water. Most birds revive within minutes. hawks and are unlikely to fly near them. Release the bird outdoors when it appears Second, silhouettes work because they alert alert. birds to the presence of the windowpane. Silhouettes do not need to be life-size to reduce window strikes. Even small images Reducing contagious diseases: help. Keeping your bird feeders clean Research suggests that the use of Poorly maintained bird feeders may kill or silhouettes works best when the images harm birds by increasing the occurrence of involved are placed on the outside of the infectious diseases. The following steps will window pane, when they contrast with any help you reduce the risk of death and disease reflected images, and when they are spaced at your feeders: uniformly over the window surface. Single silhouettes do not work as well as groups of Avoid crowding birds by providing silhouettes. Although covering the window enough feeders. Lots of birds using a uniformly with images spaced several inches feeder looks great, but close proximity apart will completely eliminate window strikes, is a key factor in spreading disease. several images spaced over large surfaces will reduce the strike-rate somewhat. Keep the feeder area clean by raking up waste food, birdseed hulls, and The patterns presented in the activity that droppings, regularly. Discard food that follows represent a series of images smells musty, is wet, looks moldy, or has recommended by Hawk Mountain Sanctuary. fungus growing on it. The images can be used in combinations or © 1998 Hawk Mountain Sanctuary HH- 3 Helpful Hawks Topic Page Silhouettes that save continued ... Facts about cats and birds Birds killed by cats include endangered There are more than 66 million pet species such as the Piping Plovers, and cats in the United States including declining species such as Black- more than 40 million that are throated Blue Warblers and Wood outdoors and unsupervised some or Thrushes. all of the time. Combined with an estimated 40 to 60 million stray and Belled cats do kill wildlife. Cats with feral cats, cats have a significant bells learn to stalk prey silently, and impact of native wildlife. many wild animals do not associate a ringing bell with danger. Scientists estimate that free- roaming cats kill hundreds of millions Even well-fed cats kill wildlife. of birds, together with more than a billion other small wildlife, in the United States, annually. Make sure that your feeders have no Reducing natural and unnatural sharp points or edges. Even small predation scratches and cuts will allow bacteria and viruses to attack otherwise Cats healthy birds. Keep cats indoors to reduce this unnecessary form of bird predation. Keeping Clean and disinfect your feeders at your cat indoors is not only good for the birds, least once per month, twice per it also is good for you and your cat. Many month if you notice sick birds. Clean veterinarians recommend that cats be kept your feeders by scrubbing them with indoors. The life expectancy of an outdoor soap and water, and then dip them cat is 2 to 5 years, compared with 10 to 15 into a 10% solution of chlorine bleach years for indoor cats. Cats that frequent the (i.e. one part liquid chlorine bleach to outdoors often are killed by cars and other 10 parts tepid water, mixed and used animals, and can be stolen, lost or poisoned. out of doors; use rubber gloves while Free-roaming cats are more likely to contract cleaning with the solution and avoid diseases such as rabies. Some of these eye contact). Rinse feeders diseases may be transferred to humans. thoroughly with clean water, and allow Although rare—only 18 cases in the United them to dry before filling them with States since 1977—almost all human cases seed. Clean and disinfect containers of pneumonic plague have been linked to with spoiled food and all other items domestic cats. More that 20,000 people per used at the feeders such as thescoop used to fill the feeders. © 1998 Hawk Mountain Sanctuary HH- 4 Topic Helpful Hawks Page Silhouettes that save continued ... year are affected by cat-scratch fever, Natural Predators acquired from infected fleas on cats. Natural predators, including several species of hawks and falcons, also take birds at bird If your cat is accustomed to roaming feeders. Natural predation is part of nature. outdoors, it will take some time and patience All hawks and falcons are protected by State to train the animal to remain indoors; but it and Federal Law. Do not interfere with can be done. The key is to make the predatory birds chasing and eating birds at conversion gradually and provide plenty of and around bird feeders. If you wish to attention and stimulation while the cat is reduce the risk of natural predation at your indoors. bird feeders, place you feeders near natural cover (including bushes and shrubs). This In addition to keeping your cat indoors, the will make feeder birds less vulnerable to following also can help provide a safer natural predation by giving them a better environment for birds, you, and your cat: chance to avoid approaching hawks and falcons. It may even reduce the rate at which If you no longer can care for your cat, these predators visit your feeders. On the take it to an animal shelter. Never other hand, if feral or pet cats visit your abandon a cat. feeders, the latter’s proximity to cover may increase predation risk rather than reduce it! Resist the urge to feed a stray cat unless you can make the commitment to offer it a home. Be a responsible pet owner; spay or neuter your cat before it can breed; put a nametag with an address and phone number on your cat; provide routine veterinary care; comply with requirements for licensing. © 1998 Hawk Mountain Sanctuary HH- 5 Helpful Hawks Activity Silhouettes that save Page Rationale This activity is designed to help you reduce the risk of window strikes by native birds. The activity meets several National Science Education Content Standards for grades K-8, including: Science as inquiry standards: Abilities necessary to do scientific inquiry (grades K-8) Understanding scientific inquiry (grades K-8) Life Sciences standards: Characteristics of organisms (grades K-8) Diversity and adaptations of organisms (grades 5-8) For additional information on these and other NSE standards see: National Research Council.
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