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Re: sauropod breeding

Well, you can probably assume highly cryptic colouring and a deeply
skittish nature,

A skittish nature at the same time as an inability to run? Is that of much use? :-/

but consider sea turtles --

Yes, but they are armored and can swim at reasonable speeds.

Also note that the whip-tail sauropods and mace-tail sauropods probably
have these defensive measures from a small size, and that they'd apply
to equivalently sized predators just fine.  So Ornithosteles is fine
with the hatchlings, and maybe even the yearlings, but has some serious
cost-benefit concerns thereafter.

Imaginable, but that's where, say, juvenile carnosaurs may start...