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>Crocs swim, but they don't seem preselected to run around on two legs.
>Swimming seems to call for small legs and big tails. Otters, beavers,
>seals, and whales are mammalian examples.
Seals (pinnipeds) have vestigal tails and are therefore a lousy example.
Perhaps you want to use something more like a manatee? Beavers don't
really use their tails for swimming much (more for bracing when they eat
trees from a bipedal stance), but platypuses do swim using their tails as
well as webbed feet.
[I'd have started off by noting the manner in which frogs swim... -- MR ]
>Rabbits may be as bipedal as some dinosaurs that are assumed to
>have been bipedal.
rabbits are hardly bipedal, or is that your point?
>Apes have big, strong forward bodies, but they are somewhat bipedal.
>Man's proportions happened overnight because somebody noticed a
>niche for an ape that could stand taller and walk farther.
This "overnight' is not supported by any of the evidence for hominid
development. Perhaps a poor example?