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1992-09-02
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Albertosaurus
TIME: Late Cretaceous
LOCALITY: North America (Alberta)
SIZE: 26 ft/8 m long
This "small" tyrannosaur shows all the
features common to the family. It was
massively built, with a big head and short
body, balanced at the hips by a long, strong
tail. Pillarlike legs, with 3-toed, spreading
feet, supported the great body weight.
Albertosaurus and other members of its
family were specialized theropods. Their arms
were puny in comparison to the body size.
They were so short that they could not have
reached up to the mouth. There were only 2
fingers on each hand, which would not have
been very effective for grasping prey. And
although the jaws could be opened wide, the
bones of the skull were rigidly fixed,
without the same degree of flexibility as
between those in the skulls of the
allosaurs.Tyrannosaurs had a well-developed
second set of ribs on the underside of the
body. A possible explanation for these extra
ribs and the short arms could be that when a
tyrannosaur rested, it lay on its belly. The
innards would have been supported by the
extra ribs, and not crushed by the great
weight of the body. When the animal got up,
its tiny arms stopped the bulky frame from
sliding forward, and steadied it as it rose
to its feet.There is also a suggestion that
the tiny arms were used by the males to hold
onto the females while mating.
Subject by: Russell Webb