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Re: A Little Brain Teaser
>Okay, here's a fun question for all of you to ponder: Name one carnivore
>(extant/extinct) that can be confidently said to be derived from an
>herbivorous ancestor. Omnivores don't count - this must be a bona fide
>carnivore (I'm not sure if insectivores count). Some graduate students here
>at Cal were talking about it yesterday and largely were stumped. All I
>could think up was that possibly carnivorous mid-Tertiary kangaroo
>(featured in Paleoworld once). I guess there's also that one
>desert-dwelling mouse that hunts voraciously (the one that howls). Any
>dinosaur examples that anyone can think of (I'm asking for good examples
>here, not wishy-washy possibilities)?
I'm not sure that we can. Dinosaurs evolved from thecodonts, a largely=
predatory group. If anything, there seems to be a popular trend for=
animals to go the other way (modern seed eating birds, for example).
Ecologically speaking, it makes more sense to go from a predatory trophic=
level to a herbiverous trophic level, simply because there is more energy=
available for consumption. It is when there is a great deal of energy on=
the herbivory level that carnivory becomes reasonable (it takes a great=
deal more to support a second carnivore level).
Q. Why is structural geology like a card game?
A. They both have folds.