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Re: Tyrannosaurid Growth Spurts

There was a recent programme on National Geographic that showed a pride of 
lions attacking an adult elephant, which may be analogous
to a flock of therapods attacking a sauropod.  However, lions are atypical of 
big cats, and one could wrongly assume that because
lions show social behaviour, all big cats do.

Amongst archosaurs, studies have shown co-operative hunting by crocs, but have 
any studies shown co-operative hunting by birds?
Also, are any predatory birds known to tackle prey as large, or larger, than 
themselves.  It has been suggested that the giant birds
of prey that inhabited New Zealand at the time humans settled there preyed on 
Moa's, and also on the early human settlers.

There have been numerous studies of the locomotive abilities of adult T. rex, 
but have similar studies been done on juveniles or
adolescents?  It would also be interesting to study the theoretical speeds of 
the prey.  If T.rex could only manage a slow run, but
hadrosaurs were even slower, then the slow running would be sufficient to 
enable adult T.rex to chase hadrosaurs and they would not
need the potentially faster adolescents to do the chasing.  If T.rex used the 
bite and wait strategy evidenced by Ken Carpenters
hadrosaur with the T.rex bite, that probably should have died from shock and 
infection with such a wound, they would only need to
get close enough to bite the tail.

Changing the subject slightly, and following the recent Archaeopteryx brain 
scan, T.rex has been the subject of CT scans that have
been used to compare its olfactory abilities with vultures, but are there any 
other similarities between the T.rex and vulture

John Hunt