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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.

  • Chicken Bucket Kfc PNG Image High Quality PNG Image

    Chicken Bucket Kfc PNG Image High Quality
    Format: PNG
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    Chicken Fried Popeyes Download HD
    Format: PNG
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    Coal Chicken Barbecue Free Photo
    Format: PNG
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  • Chicken Bucket Kfc HQ Image Free PNG Image

    Chicken Bucket Kfc HQ Image Free
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  • Chicken Pic Kfc Free HD Image PNG Image

    Chicken Pic Kfc Free HD Image
    Format: PNG
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  • Photos Chicken Fried Free Download PNG HQ PNG Image

    Photos Chicken Fried Free Download PNG HQ
    Format: PNG
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  • Barbecue Chicken Black Grill Download Free Image PNG Image

    Barbecue Chicken Black Grill Download Free Image
    Format: PNG
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    Size: 197.1KB
    Downloads: 71
  • Photos Chicken Fried Popeyes PNG Image High Quality PNG Image

    Photos Chicken Fried Popeyes PNG Image High Quality
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  • Chicken Crunchy Kfc Free Clipart HQ PNG Image

    Chicken Crunchy Kfc Free Clipart HQ
    Format: PNG
    Resolution: 1400x1028
    Size: 528.9KB
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  • Chicken Kfc Download HD PNG Image

    Chicken Kfc Download HD
    Format: PNG
    Resolution: 640x349
    Size: 81.1KB
    Downloads: 71
  • Chicken Fried Popeyes Download HD PNG Image

    Chicken Fried Popeyes Download HD
    Format: PNG
    Resolution: 749x286
    Size: 283.8KB
    Downloads: 69
  • Chicken Fried Wings PNG Free Photo PNG Image

    Chicken Fried Wings PNG Free Photo
    Format: PNG
    Resolution: 900x386
    Size: 509.3KB
    Downloads: 67
  • Popeyes Chicken Fried Crispy Download Free Image PNG Image

    Popeyes Chicken Fried Crispy Download Free Image
    Format: PNG
    Resolution: 620x300
    Size: 79.1KB
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  • Drumstick Chicken Barbecue HQ Image Free PNG Image

    Drumstick Chicken Barbecue HQ Image Free
    Format: PNG
    Resolution: 1280x1121
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    Downloads: 66
  • Chicken Wings Download Free Image PNG Image

    Chicken Wings Download Free Image
    Format: PNG
    Resolution: 860x462
    Size: 321.6KB
    Downloads: 65
  • Popeyes Chicken Fried Crispy HQ Image Free PNG Image

    Popeyes Chicken Fried Crispy HQ Image Free
    Format: PNG
    Resolution: 541x347
    Size: 284.8KB
    Downloads: 65
  • Barbecue Chicken Coal Download HQ PNG Image

    Barbecue Chicken Coal Download HQ
    Format: PNG
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    Size: 494.5KB
    Downloads: 64
  • Chicken Fried Popeyes Free Clipart HQ PNG Image

    Chicken Fried Popeyes Free Clipart HQ
    Format: PNG
    Resolution: 615x576
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    Downloads: 64
  • Photos Chicken Crunchy Kfc PNG Image High Quality PNG Image

    Photos Chicken Crunchy Kfc PNG Image High Quality
    Format: PNG
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  • Chicken Wings Free Download PNG HD PNG Image

    Chicken Wings Free Download PNG HD
    Format: PNG
    Resolution: 600x600
    Size: 207.5KB
    Downloads: 64