Gallus gallus is a domesticated bird known as the chicken which is believed to have first bred in southeast Asia. Ever since Darwin, we have known that the chicken originated in southeast Asia, although the exact details of which one or more of several possible jungle fowls is the primal form has been debated. The idea that the existence of chicken is the contribution of more than one wild species has been on the table for a very long time. Notice the yellow legs on this chicken. If you pluck out the feathers, you will find the skin to be yellow as well. But if you go find, say, a crow, and pluck its feathers, it will be greyish in colour. The gist of this is that some birds are yellow while some are not.
There is a gene that is expressed in certain tissues that produces an enzyme that cleaves the carotenoid molecules that provide the yellow colour. You get a yellow bird (depending on other factors we shall ignore) if there is no functional copy of this gene. In short, it is confirmed by the new research that previously thought the red jungle fowl, Gallus gallus, is ancestral to the modern chicken, as Darwin suspected. But this research also suggests that another bird, the grey jungle fowl, Gallus sonneratii, also contributed to the chicken's genome, providing the yellow color we see on this chicken's legs.

In this sub category you can download free PNG images: Chicken Animals. In this category "Chicken" we have 45 free PNG images with transparent background.

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  Chicken Head Png Image
  Format: PNG
  Resolution: 400x400
  Size: 58.0KB
  Downloads: 1,692
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  Chicken Png Image
  Format: PNG
  Resolution: 2699x2319
  Size: 2.5MB
  Downloads: 1,058
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  White Chicken Png Image
  Format: PNG
  Resolution: 2055x2256
  Size: 1.5MB
  Downloads: 3,215
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  Chicken Png Image
  Format: PNG
  Resolution: 275x184
  Size: 18.4KB
  Downloads: 1,762
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  Chicken Png Image
  Format: PNG
  Resolution: 243x329
  Size: 30.4KB
  Downloads: 1,494
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  Chicken Png Image
  Format: PNG
  Resolution: 219x295
  Size: 26.6KB
  Downloads: 1,116
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  Chicken Png Image
  Format: PNG
  Resolution: 314x514
  Size: 66.7KB
  Downloads: 1,282
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  Chicken Png Image
  Format: PNG
  Resolution: 3567x2796
  Size: 926.9KB
  Downloads: 982
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  Black Siluete Chicken Png Image
  Format: PNG
  Resolution: 415x500
  Size: 7.3KB
  Downloads: 860
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  Chicken Png Image
  Format: PNG
  Resolution: 1812x2486
  Size: 1.7MB
  Downloads: 707
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  Chicken Png Image
  Format: PNG
  Resolution: 2370x3272
  Size: 5.3MB
  Downloads: 874
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  Chicken Png Image
  Format: PNG
  Resolution: 1811x2484
  Size: 1.7MB
  Downloads: 591
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  Chicken Png Image
  Format: PNG
  Resolution: 1890x2551
  Size: 1.7MB
  Downloads: 916
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  Chicken Png Image
  Format: PNG
  Resolution: 2565x3544
  Size: 2.8MB
  Downloads: 1,336
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  White Chicken Png Image
  Format: PNG
  Resolution: 1772x3161
  Size: 1.9MB
  Downloads: 824
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  Chicken Png Image
  Format: PNG
  Resolution: 1849x2061
  Size: 1.4MB
  Downloads: 727
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  Chicken Png Image
  Format: PNG
  Resolution: 1902x2802
  Size: 1.4MB
  Downloads: 459
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  Chicken Png Image
  Format: PNG
  Resolution: 1000x799
  Size: 139.7KB
  Downloads: 688
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  Chicken Png Image
  Format: PNG
  Resolution: 300x321
  Size: 25.2KB
  Downloads: 823
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  Chicken Png Image
  Format: PNG
  Resolution: 2700x2536
  Size: 2.5MB
  Downloads: 801

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