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little bird animation

Little Bird Animation

Birds have two sexes: male and female. The sex of birds is determined by the Z and W sex chromosomes, rather than by the X and Y chromosomes present in mammals. Male birds have two Z chromosomes (ZZ), and female birds have a W chromosome and a Z chromosome (WZ).
In nearly all species of birds, an individual's sex is determined at fertilization. However, one recent study demonstrated temperature-dependent sex determination among Australian Brush-turkeys, for which higher temperatures during incubation resulted in a higher female-to-male sex ratio.

File information
Album name:Fauna & Flora
Rating (1 votes):55555
Keywords:#little #bird #animation
Filesize:485 KiB
Date added:Mar 23, 2012
Dimensions:250 x 188 pixels
Displayed:172 times
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