Few days ago I have watched a DVD: “Dinosaurs: Perfect
Predators”. What conclusions can be drawn from it?
Firstly, Beyond T-Rex: this program deals with the
discovery of two of T-Rex’s biggest competitors: giganotosaurus and
carcharodontosaurus, two closely related carnosaur cousins. As such, they were
closely related to the allosaurus of the Jurassic time period, meaning that
they were more primitive than the T-Rex, in some ways, mainly in regards to
smarts. T-Rex itself had an IQ somewhere between the American alligator and the
common house cat, and the carnosaurs were even less intelligent.
Furthermore, size for size, the carnosaurs had a weaker bite
than the T-Rex’s but stronger – and larger - forearms with bigger claws to
compensate this relatively weaker bite; if T-Rex and its cousins acted like
modern crocodiles do, bit down hard and tore deep, gaping wounds, the carnosaurs
acted more like the sharks’, inflicting shallower, but heavily bleeding wounds
– hence the difference in their teeth. If the T-Rex’s teeth were ‘railroad
spikes’, then the carnosaurs’ teeth were more like blades, more easily broken
and which slashed rather than stabbed.
This was demonstrated in both Beyond T-Rex and Monsters
Resurrected: Giant American Predator, which featured yet another carnosaur:
acrocanthosaurus (acro). At 8 meters in length it was smaller than the
carcharodontosaurus and giganotosaurus, but still larger than the T-Rex with
much more developed forelimbs yet a slimmer, and relatively weaker, snout. That
said, this weaker bite was compensated by its neck and backbone ridge that
allowed acrocanthosaurus to clamp on, like a vise, onto its prey – giant
sauropods like paluxysaurus, now apparently re-named into sauroposeidon. T-Rex
could not do that for all of its awesomeness, if it bit down, it would bite
right through, unlike the carnosaurs, which could not bite through bone.
On the other hand, at the end of the Cretaceous, when T-Rex
walked the Earth, there were little to no sauropods in North America, so who
knows how tyrannosaurus would have handled them overall.
Finally, there was Clash of the Dinosaurs: Perfect
Predators, which focused on T-Rex, deinonychus and quetzalcoatlus. The
latter, incidentally, is a pterosaur – a flying reptile, not a dinosaur. This
feature showed clips of the predators hunting herbivores, including paluxysaurus/sauroposeidon,
and it was done by deinonychus the raptor, (also featured in Monsters Resurrected:
Giant American Predator), not
tyrannosaurus.
In other words,
here is how the cookie crumbled. The carnosaurs, featured in Beyond T-Rex
and Monsters Resurrected: Giant American Predator had remained relatively basic, somewhat primitive creatures, only
growing larger in size and specializing in feeding only on sauropods: when
acrocanthosaurus, for example, had to deal with an armored dinosaur called
sauropelta, it failed completely, and when the sauropods died out, so did the
carnosaurs.
The tyrannosaurs
and the raptors, on the other hand, were more specialized. Size for size, tyrannosaurs
– especially T-Rex itself – were more stocky and robust than the carnosaurs,
probably ambush hunters than long-distance chasers. Their forelimbs were
smaller, especially in proportion to the rest of the body, but their heads and
jaws were much larger and their bite – much stronger.
The raptors, on the
other hand, had well-developed claws both on front and especially on the hind
legs, but their teeth, though sharp, were small and probably relatively
ineffective as killing tools, especially for smaller species such as
velociraptors. (An utahraptor, easily 6 m long, was probably a somewhat
different story.) Thus they used their
claws to deliver the killing blows, as Clash of the Dinosaurs: Perfect
Predators demonstrated. So...
So, the DVD
“Dinosaurs: Perfect Predators” demonstrated three ways that the evolution of
dinosaur predators occurred. One was the basic design of the carnosaurs,
similar to that of the original carnivorous dinosaurs, but blown to gigantic
proportions. The second – that of the tyrannosaurs – was the increasing
specialization of jaw power. And the third – that of the raptors – was the
increased specialization of claws instead. Put otherwise, the carnosaurs were
the biggest, the tyrannosaurs – the strongest, and the raptors – the fastest.
Neat.
As for the DVD itself, it is well put together and the viewing
quality is quite good. The images on the cover, admittedly, belong to none of
the features mentioned inside, but that is beside the point. I rate this DVD
4.5 stars out of 5.