[cookcounty]

"The divergence occurred some 166 million years ago from primitive ancestors combining features of both mammals and reptiles."

So..., the duckbill, webfeet, egg-laying, and venom-spouting all arose quickly and together at 166MYA?

[Alter Kaker]

So..., the duckbill, webfeet, egg-laying, and venom-spouting all arose quickly and together at 166MYA?

No.