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They only circle round the truth like birds flying in the sun . Many broods are brought off during the year , with birds nesting from late winter throughout the summer to early winter . He works in complex networks theory , which is the study of interacting systems — from flocks of birds in flight to computers wired through the Internet . Over 30 species of birds have been identified and several species of mammals , reptiles , amphibians and invertebrates have been observed . With this change , we are now entering the summer nesting season for the remainder of birds in the area . The viruses are only found in a small number of birds in the wild , usually waterfowl and shorebirds , and rarely cause disease in these birds . It provides resting habitat for migrating waterfowl and over 115 species of birds have been documented for this area . In addition to hosting its own content , the site links to audio podcasts from Mann Library ; video tours of the Law School ; the eClips collection of videos about entrepreneurship , business and leadership ; audio and video from the College of Human Ecology ; multimedia stories about the Campaign for Cornell ; video clips of birds in action from the Lab of Ornithology ; educational programs from Cybertower ; and audio and video news from Cornell Chronicle Online . With " Winged Migration " , Perrin explores the mystery of birds in flight . " Since 1997 , millions of birds have been infected by H5N1 , but there are just 218 known human cases . Millions of birds have died or been culled as a result of outbreaks in numerous countries worldwide since the lethal H5N1 avian flu virus strain emerged in South-East Asia in December 2003 , before spreading to Europe and Africa . Herons Head Park supports over 78 species of birds annually , and is an important rest stop for migratory birds along the Pacific Flyway . More than 270 species of birds have been sighted here , and the prehistoric-looking American alligator is the park 's most noteworthy resident .