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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  Cooked Chicken Transparent Image
  Format: PNG
  Resolution: 904x600
  Size: 813.6KB
  Downloads: 958
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  Cooked Chicken Image
  Format: PNG
  Resolution: 1457x972
  Size: 1.9MB
  Downloads: 609
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  Chicken Transparent
  Format: PNG
  Resolution: 900x886
  Size: 363.5KB
  Downloads: 606
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  Cooked Chicken Photos
  Format: PNG
  Resolution: 500x500
  Size: 317.5KB
  Downloads: 509
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  Cooked Chicken Clipart
  Format: PNG
  Resolution: 904x600
  Size: 498.2KB
  Downloads: 448
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  Chicken Image
  Format: PNG
  Resolution: 2055x2256
  Size: 1.5MB
  Downloads: 444
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  Chicken Clipart
  Format: PNG
  Resolution: 2580x1939
  Size: 2.1MB
  Downloads: 427
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  Chicken Transparent Image
  Format: PNG
  Resolution: 540x640
  Size: 118.4KB
  Downloads: 421
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  Cooked Chicken Transparent
  Format: PNG
  Resolution: 740x774
  Size: 620.6KB
  Downloads: 420
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  Chicken File
  Format: PNG
  Resolution: 1772x3161
  Size: 1.9MB
  Downloads: 400
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  Cooked Chicken File
  Format: PNG
  Resolution: 1200x799
  Size: 1.7MB
  Downloads: 384
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  Chicken Photos
  Format: PNG
  Resolution: 1812x2486
  Size: 1.7MB
  Downloads: 357
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  Chicken Wings Download Free Image
  Format: PNG
  Resolution: 860x553
  Size: 528.8KB
  Downloads: 100
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  Chicken Fried Wings Free Clipart HQ
  Format: PNG
  Resolution: 900x725
  Size: 463.1KB
  Downloads: 100
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  Pic Popeyes Chicken Fried Crispy
  Format: PNG
  Resolution: 600x460
  Size: 455.9KB
  Downloads: 100
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  Barbecue Chicken Download Free Image
  Format: PNG
  Resolution: 672x430
  Size: 275.3KB
  Downloads: 100
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  Chicken Fried Wings Free HQ Image
  Format: PNG
  Resolution: 820x385
  Size: 301.8KB
  Downloads: 98
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  Chicken Bucket Kfc PNG File HD
  Format: PNG
  Resolution: 531x620
  Size: 382.9KB
  Downloads: 98
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  Popeyes Chicken Fried Crispy PNG Free Photo
  Format: PNG
  Resolution: 516x348
  Size: 310.0KB
  Downloads: 98
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  Barbecue Chicken Serving Free Transparent Image HQ
  Format: PNG
  Resolution: 900x473
  Size: 635.4KB
  Downloads: 97

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