Monthly Archives: July 2013

Why Care?

Shadows A great shadow sweeps the ground. A bird. Large, dark, silent – banking into the wind. Hawk? Vulture? No! An eagle! Spiraling up till it’s just a speck in the sky. Another day, no shadow – a black dot. … Continue reading

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Avian Biological Systems

Articles: The Avian Respiratory System; Raptor Vision, Parts I & II – some of the graphics in these articles are adapted from textbooks and reference articles.  November 2013 The Avian Respiratory System  Immature Turkey Vulture Nares  The avian respiratory system, … Continue reading

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Adaptations for Flight

revised March 11, 2014 Adaptations for Bird Flight Eagle Flight The first animals to develop powered flight were prehistoric insects. Their wings are not at all like those of vertebrate flyers, either bird or bat, and their flight patterns, even today, … Continue reading

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