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A Brief History Pointing to Innate Behavior. Friedrich Goethe was the first to perform experiments using silhouettes (1937, 1940). He found that naive Capercaillie exhibited a greater fear response to a silhouette of a hawk than to a circle, a triangle, or a generalized bird silhouette, but that this varied with both species, and prior experience. [9]
Birds strike glass because reflective or transparent glass is often invisible to them. [1] It is estimated that between 100 million and 1 billion birds are killed by collisions in the United States annually, [ 2 ] and an estimated 16 to 42 million birds are likewise killed each year in Canada .
When attempting to identify a flying raptor Debus & Davies [3] recommend concentrating on the bird's silhouette (including shape of wings and proportions), flight style and vocalisations, rather than on details of colouration.
The Pulfrich effect is the effect that covering one eye with transparent but darkened glass can cause purely lateral motion to appear to have a depth component even though in reality it doesn't; even a completely flat scene such as one shown on a television screen can appear to exhibit some three-dimensional motion, but this is an illusion ...
A stylised superb lyrebird appears in the transparent window of the Australian 100 dollar note. A silhouette of a male superb lyrebird is the logo of the Australian Film Commission. An illustration of a male superb lyrebird, in courtship display, is the emblem of the New South Wales National Parks and Wildlife Service.
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[14] [19] [20] The mean wingspan is around 283 cm (9 ft 3 in) and the wings have the largest surface area of any extant bird. [20] It has a maximum wingspan of 3.3 m (10 ft 10 in). [21] Among living bird species, only the great albatrosses and the two largest species of pelican exceed the Andean condor in average and maximal wingspan. [20] [22]
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