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 Food. In this category "Chicken" we have 108 free PNG images with transparent background.

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  Grill Chicken Barbecue Free HD Image
  Format: PNG
  Resolution: 1795x1322
  Size: 4.9MB
  Downloads: 61
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  Barbecue Chicken Drumstick PNG File HD
  Format: PNG
  Resolution: 500x305
  Size: 201.5KB
  Downloads: 80
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  Barbecue Chicken Seekh HD Image Free
  Format: PNG
  Resolution: 700x389
  Size: 100.9KB
  Downloads: 86
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  Barbecue Chicken Serving Download HD
  Format: PNG
  Resolution: 800x459
  Size: 142.2KB
  Downloads: 84
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  Barbecue Chicken Vector Free Clipart HQ
  Format: PNG
  Resolution: 512x512
  Size: 30.9KB
  Downloads: 53
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  Chicken Crunchy Kfc Free Clipart HQ
  Format: PNG
  Resolution: 1400x1028
  Size: 528.9KB
  Downloads: 71
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  Chicken Crunchy Kfc HQ Image Free
  Format: PNG
  Resolution: 1217x572
  Size: 634.5KB
  Downloads: 62
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  Photos Chicken Crunchy Kfc PNG Image High Quality
  Format: PNG
  Resolution: 500x375
  Size: 90.6KB
  Downloads: 64
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  Chicken Bucket Kfc HQ Image Free
  Format: PNG
  Resolution: 792x557
  Size: 604.1KB
  Downloads: 72
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  Chicken Bucket Kfc Free HD Image
  Format: PNG
  Resolution: 500x630
  Size: 107.9KB
  Downloads: 87
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  Chicken Bucket Kfc HD Image Free
  Format: PNG
  Resolution: 601x450
  Size: 147.5KB
  Downloads: 91
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  Chicken Bucket Kfc Free Download PNG HQ
  Format: PNG
  Resolution: 600x600
  Size: 354.7KB
  Downloads: 85
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  Chicken Kfc Free HQ Image
  Format: PNG
  Resolution: 1634x929
  Size: 1.6MB
  Downloads: 84
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  Chicken Kfc Download HD
  Format: PNG
  Resolution: 640x349
  Size: 81.1KB
  Downloads: 71
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  Chicken Fried Free HQ Image
  Format: PNG
  Resolution: 1024x664
  Size: 1006.8KB
  Downloads: 56
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  Chicken Fried Free HD Image
  Format: PNG
  Resolution: 516x348
  Size: 310.0KB
  Downloads: 81
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  Chicken Fried Free PNG HQ
  Format: PNG
  Resolution: 1599x866
  Size: 1.6MB
  Downloads: 88
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  Chicken Fried Free Transparent Image HD
  Format: PNG
  Resolution: 700x349
  Size: 391.1KB
  Downloads: 77
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  Popeyes Chicken Fried Crispy PNG Free Photo
  Format: PNG
  Resolution: 850x665
  Size: 264.3KB
  Downloads: 45
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  Pic Popeyes Chicken Fried Crispy
  Format: PNG
  Resolution: 600x460
  Size: 455.9KB
  Downloads: 100

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