Bird Wing

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There are two types of classification, homology and analogy. Homology is the fundamental identity of structure, as distinguished from analogy, which incidental resemblance in form or function. Bird wing showing homolog and analogy


Bird Anatomy


Winchell, Alexander Sketches of Creation (New York, NY: Harper & Brothers, 1870)


TIFF (full resolution)

2400×888, 345.0 KiB

Large GIF

1024×378, 49.8 KiB

Medium GIF

640×236, 25.6 KiB

Small GIF

320×118, 9.5 KiB