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re: T. rex
> I am impressed by studies suggesting T. rex ...`
> had insufficient femoral bone mass to
> sustain running speed (e.g. R. M. Alexander, "How dinosaurs ran" in
> Scientific American, --I'll dig up the date and page if anyone's
> If this is correct, then its unlikely they were (at least) pursuit
> predators. Given that ceratopsians _could_ gallop by the same
> as could hadrosaurs, T. rex must have been either an ambush predator
> or a scavenger. THe latter seems more parsimonious to me, given the
> size (and smell?) of the beasts.
What large terrestrial scavengers do you know of?
I know of none. I know of some large *aerial* scavengers,
the condors), but no really large non-flying terrestrial
scavengers. The largest land animal I know of that is primarily
a scavenger is one of the smaller species of hyena. (The large
hyena you usually see in documentaries is as much a hunter as
the lion, or more so).
I do not believe that it is *possible* for a non-flying land
animal to be a scavenger at the size of T. rex and its relatives.
Also, scavenging does not explain the *strength* of the arms.
If the arms were small and *weak* that would be one thing,
but they are not.
I would like to see the bone mass studies verified before I
drew any radical conclusions from them. But ambush hunting
is certainly a possibility. [Though some tyrannosaurs *were*
fast runners, as they had the leg proportions of runners].
The peace of God be with you.
- re: T. rex
- From: "John E. Burton Jr." <email@example.com>