[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Predators of the non-stealthy egg theory.
> Mammals were small and vulnerable to open-
> field attack. While there were dinosaurs around there could be
> no mammals. While they lived, the dinosaurs (like crocodiles in
> the semi-aquatic environment) were niche sovereigns.
What about the niches where they were likely direct competitors such
as egg-eating. We KNOW dinosaurs ate dinosaur eggs (or we did for
quite some time, but now we are a bit confused about such things as
Oviraptor.) We BELIEVE mammals ate dinosaur eggs. Isn't this direct
competition? The same niche? Is your arguement for your position or
(It was probably a competition that lasted as long as mammals and
dinosaurs existing together (what, 120 million years?) so would you
say the extinction was a result of egg-predation over a very long
period, or was it perhaps something a little more specific to the 60
> But there _is_ much evidence of change, especially in
> mammals. Cognitive development is quantifiable (cranial
> capacity). This newly evolved "technology" could allow the
> mammal to learn new predatory tactics. For example, they could
> now imagine a group of eggs which were out of site, under a pile
> of leaves (incidentally, my 7 yr old daughter's science project
> involves egg-predation and crows. She, is piling wood chips and
> leaves on top of an egg which she puts out each day. Today the
> crows rummaged through a one foot pile to reach the egg.
Your 7 yr old has evolved 60 million years further than the state of
mammals at the extinction of the dinosaurs. So have the crows.
Perhaps the "technology" of cognitive thought is a little newer than,
say, the Late Cretaceous. Where is the evidence to support or deny
this? I'd like to see a fossilized thought, please.;]
> Mammal egg layers could be stealthy. They could put them in
> burrows. Look at the platypus. It burrows _under water_. Tell
> me that is not an adaptation for stealth--against egg predation!
Underwater burrows would still allow access for snakes and crocs, I
don't see how water-oriented burrows would actually be all that much
better for the platypus than a ordinary burrow, nor where cognitive
thought guided the platypus in choosing the same sort of burrow as,
say, a burrowing owl would. (As I understand it, platypuses are dumb
as bricks) The platypus is laying it's eggs on a landmass which is
known for it's impressive fossil record of really really big snakes.