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Re: Again :-] : Re: Again: origin of bird flight
> >If, OTOH, the predator jumps off from 2 m, the jump lasts so long that
> >prey will escape in too many cases.
> This only applies when the predator is Wile E. Coyote and the potential
> is Road Runner. Wile E. Coyote possesses the selectively advantageous
> of having a lag between the moment when he realises he's suspended in
> mid-air and the moment when gravity begins to have an effect.
> For all other predators, the time it takes to fall is not too different
> between whether the height is 1m or 2m above ground. I could do the math,
I've done it. Falling from 2 m, neglecting drag, takes less than a second.
> but it might be better simply to climb a tree with a stopwatch and see for
I'll try... (After experimental archaeology, experimental palaeontology!
> >Hunting frogs is difficult. Considerably larger size, and maybe
> >or an ability to swim, will help.
> Once, several years ago, when standing on my patio, I spied a frog in my
> backyard - siting maybe 3m away. The patio was about 1.5m above the lawn.
> I clambered over the railing of the patio, and jumped onto the lawn,
> within about 1m of the frog. I could have landed closer to the frog, but
> didn't want to land right on top of it. There was no water or trees
> and I could have easily have pounced on the frog and caught it. But I'm
> a natural predator of frogs, and (outside of French restuarants) I don't
> usually eat them. I observed the little frog jumping away, in the
> of the rockery.
I didn't write "impossible". I've managed once to touch a frog from behind
(on a cool day IIRC) some years ago. However, 10 m from the door there is a
nature reserve with several small lakes. Hundreds of frogs here. I have
tried hard to _see_ some -- this is hardly possible, all I normally notice
is the splash when one jumps into the water.
Too small size, anyway, is probably no advantage in hunting (respectively
eating) frogs, compared to compsognathid or stork size.