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.

  • Chicken Head Png Image PNG Image
    Chicken Head Png Image
    Format: PNG
    Resolution: 400x400
    Size: 58.0KB
    Downloads: 1,692
  • Chicken Png Image PNG Image
    Chicken Png Image
    Format: PNG
    Resolution: 2565x3544
    Size: 2.8MB
    Downloads: 1,336
  • Chicken Png Image PNG Image
    Chicken Png Image
    Format: PNG
    Resolution: 1890x2551
    Size: 1.7MB
    Downloads: 916
  • Chicken Png Image PNG Image
    Chicken Png Image
    Format: PNG
    Resolution: 314x514
    Size: 66.7KB
    Downloads: 1,282
  • Chicken Png Image PNG Image
    Chicken Png Image
    Format: PNG
    Resolution: 2699x2319
    Size: 2.5MB
    Downloads: 1,058

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