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Re: Dinosaur egg-laying contributed to extinction?
> Do we really know how much parental care the K mammals
> invested in their young? Is'nt it possible that the early
> (not to clear on when placentals get their start and if the
> boundary ones were 'early) produced live-birth young that
> were pretty
Seeing as how all living mammal species produce milk, from monotremes, to
marsupials, to placentals - and those groups diverged long before the K-Pg
extinction - one must assume that Mammals in the Cretaceous produced milk, and
thus fed and cared for their young to a large enough extent that mammary glands
were conserved in all the lineages that lead to the crown group.
> Problem there is things like crocodiles. Or sharks. Or
> producing a larval form (which, very similarly to things
> sauropods, had young that occupied very different niches
> than adults).
Yes, but I don't think anyone is arguing that this was the sole criteria for
survival. For example, such creatures generally have low metabolic rates