you are viewing a single comment's thread
view the rest of the comments
[–] 29 points 7 months ago (2 children)

My stance is that creatures were laying eggs millions of years before the first chicken was born.

  • source
  • hideshow 2 child comments
  • [–] 2 points 7 months ago

    Yes, based on a quick lookup, it appears that the first (internal) egg was produced by sexually-reproducing animals over 600m yrs ago. Later, shelled (external) eggs seem to have appeared about ~315yrs ago.

    So basically, the egg was a very ancient, fundamental innovation in complex life that appeared well before galliforms (chickens and relatives) did, ~85m yrs ago.

  • source
  • parent