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crocs and hadrosaurs (was science proect)
Steve Throop wrote:
>Suppose a giant croc was in ambush at the water's edge when he heard a
>three-ton duckbill running toward him. Wouldn't discretion be the
>better part of valor? After all, a croc killed by accident would still
If I was the croc, I'd be much more worried about what was chasing the
duckbill. It's just as big and has more teeth besides. And would
probably just as happy eating croc (tastes like chicken) as dinosaur.
Actually crocs near the shore would more likely be spotted by the taller
T rex as they lose their camoflage abilities when viewed from above (like
in croc pits at zoos), so the crocs would probably be leary of coming
within reach of a taller advisary. This would seem to also work against
the crocs and for duckbills-except with the newer quadrepedal posture of
duckbills (and not the old bipedal one) their heads would be much closer
to the ground, especially while feeding, than T rex's and so the crocs
could still depend on camouflage for stealth.
>In movies, crocs swim long distances toward human swimmers. Is that
>accurate? GS Paul said, "Reptiles cannot aerobically sustain speeds
>over 1-2 km/h no matter how toasty warm they may be." If they're that
>slow on land, it sounds as if a croc in the water would be pretty slow
>once its anaerobic energy ran out.
crocs and alligators and caimans (did I leave any out?) are all very
efficient in the water. They are all built to swim with minimum energy
out-put; the tail does most of the work while the body remains fairly
stable and the legs hardly move at all. Most of the modern crocs'
hunting technic is merely hanging out unmoving in the water till it can
sneak up on somebody else and grab it, pull it under and hold it under
long enough to drown it. I don't have statistics on any croc metabolism,
but I'm willing to vernture that there is less energy spent cutting
through water while bouyant, than in getting out of the water to sun.
>At least some duckbill genera inhabited conspicuous nesting grounds as
>their young grew. These were apparently not in swamps, but doesn't this
>imply that they had methods of standing their ground against predators?
Maiasaurs nested on lakeshores-not strictly a swamp, but pretty similar
conditions. Sort of like how modern flamingoes and storks nest in the
mudflats of the African savannahs after the rains. Both of these can fly
to protect the adults, but they rely on the water to isolate and protect
>Don't crows drive hawks and owls from an area by harassment? Couldn't
>duckbills also have used commotion and tooting to encourage big crocs
probably not crocs- modern types hunt by camouflaging themselves and
waiting for prey to come by. In all likely hood, it's only the first
duckbill which would be taken unawares, and the rest of the herd would be
alerted by the struggle. Since the croc kills by strangulation and
drowning, the duckbill may not be able to honk at all-no matter how big
it's crest is. (or conversly-maybe that's what the dang things are
for-doesn't seem likely since there would be no muscle forcing the air
>Have horses and goats been known to kill snakes on sight? Humans, dogs,
>and cats seem to have that impulse.
having been exposed to all of the above, I'd say cats and dogs mess with
snakes because they have a hunting instinct to kill little
things-salamanders or lizards would get exactly the same treatment.
Horses don't like things they can't see which make unusual noise (like
rattling rattlesnakes) but will ignore gartersnakes in their stalls
simply because they don't see them. Goats just get bored unless the
snake does something to interest them. People are just plain ol' dumb to
kill a snake-means they were raised wrong
>If duckbills instinctively stamped on small crocs, that would eventually
>reduce the chances of meeting a big, hungry one.
or any more duckbills-whose babies LOOK an AWFUL lot like BABY CROCS.
on another note-would sea-going crocodiles hunt similarily to modern
crocs by using stealth? What did the sea-going crocs eat?
I haven't got any info at all on their feeding habits or probable niche.