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>...as opposed to Peter Galton's now-old picture of a hadrosaur
>running bipedally with the arms all the way back, like the basilisk.
>ICK! Are they tucking simply to get the arms out of the way? Having
>longer arms that are used in quadrupedal locomotion would necessitate
>getting them out of the way.
After thinking about the stuff I sent yesterday, and seeing this, I
want to change my initial statement slightly. Moving limbs out of the
way while tucking is VERY important, and a secondary consideration for
the appendages NOT being used for locomotion.. (I realized last night
THAT is why both ostrich and emu raise their wings during extended
stride running, not merely for cooling, but to give more clearance to
the upper thigh during the stride).
This is something the large-limbed therapods and dromosauridae would
just about have to do during an extended stride so thir hindclaws
don't tangle with their forelimbs. Any of the
Veloceraptor/Deinonychus group would HAVE to run with their arms up
and forewards as the damn foot-claw would need lots and lots of
Also, while kangaroo ARE bipedal (sort of) AND have tails, I long ago
discounted kangaroo as a viable comparison for dinosaur because of the
wierd hip/femur structure they (kangaroo) have. I had a comparitive
anatomy instructor in school that pointed out that kangaroo simply
can't take alternate strides with their back legs. Their hips won't
let them. They do that wierd foreleg/backleg reach-and-hop, or the
big bounce, but they neither walk nor run. I don't even think they
could scratch behind the ear with one foot as most animals do. Their
hips simply won't let them. I spent several weeks at the SF Zoo
during this class, drawing and observing kangaroo and wallabies, and
never saw one take any kind of alternate stride. Wierd, isn't it?