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Re: What did Spinosaurus eat? New species of Lepidotes found
On 2/21/2011 1:18 AM, Tim Williams wrote:
Nevertheless, IMHO it is curious that it was not until the evolution
of Avialae that dinosaurs became specialized for fully aquatic habits.
Some (like the spinosaurids) flirted; but none 'took the plunge'.
I think there is a size constraint here -- taking as working assumptions
that the ability to nest competently on dry land was critical to
individual dinosaurs, and also that the occasional forced overland trek
is a part of most semi-aquatic lifestyles -- the larger dinosaurs were
logically limited to a foot design that functioned well on land,
whatever their daily habits.
Is it even theoretically possible to construct a foot/leg system that
continues to work well on dry land for a massive and fully-erect animal,
yet contains "aquatic improvements" that would be obvious to someone
looking at the bones?
Heh -- as to spinosaurs -- given the potential of a spinosaurid body to
clog a shallow water column w/ silt, and their general tactical capacity
to adopt heron-like or bear-in-a-salmon stream tactics, I doubt they had
to swim well to catch lepidotes or nile perch anyway.