The lecturer talks about various aspects of R. robustus that imply that it actively ran and hunted its prey which is in stark contrast to what the passage suggests.
Firstly, it is generally the case that the animals that hunted other animals are roughly twice the mass of their prey. Taking this observation into consideration, R. robustus was approximately twice the mass of baby psittacosaur dinosaur and the lecturer decisively concludes that R. robustus in fact hunted baby psittacosaur dinosaur and other similar sized animals. This assertion by the lecturer rebuts the passage which claim that R. robustus could not have hunted the dinosaur due to its small size.
Secondly, an animal named Tasmania Devil has similar leg position when compared to that of R. robustus. And Tasmania Devil can reach speeds up to 50 KMPH. Given that Tasmania Devil can run at such speed, it can be safely inferred that R. robustus also ran at similar speeds enabling it to chase fast moving prey. This is in contradiction to the passage that implies that the leg position of R. robustus would not enable them to run at high speed.
Finally, the passage points out that there are no teeth marks on the dinosaur bones found in the R. robustus fossil which indicates that R. robustus fed on the eggs of the dinosaur while scavenging. However, it is said in the lecture, that R. robustus, in spite of having strong jaw bones, did not chew its prey. Instead, R. robustus swallowed its prey in large pieces which explains the absence of teeth marks on the fossil bones.
The lecturer talks about various aspects of R.
robustus
that imply that it
actively
ran and hunted its prey which is in stark contrast to what the
passage
suggests.
Firstly
, it is
generally
the case that the
animals
that hunted other
animals
are roughly twice the mass of their prey. Taking this observation into consideration, R.
robustus
was approximately twice the mass of baby
psittacosaur
dinosaur
and the lecturer
decisively
concludes that R.
robustus
in fact hunted baby
psittacosaur
dinosaur
and other similar sized
animals
. This assertion by the lecturer rebuts the
passage
which claim that R.
robustus
could not have hunted the
dinosaur
due to its
small
size.
Secondly
, an
animal
named Tasmania Devil has similar leg position when compared to that of R.
robustus
. And Tasmania Devil can reach
speeds up
to 50
KMPH
.
Given
that Tasmania Devil can run at such speed, it can be
safely
inferred that R.
robustus
also
ran at similar speeds enabling it to chase
fast
moving prey. This is in contradiction to the
passage
that implies that the leg position of R.
robustus
would not enable them to run at high speed.
Finally
, the
passage
points out that there are no teeth marks on the
dinosaur
bones found in the R.
robustus
fossil which indicates that R.
robustus
fed on the eggs of the
dinosaur
while scavenging.
However
, it
is said
in the lecture, that R.
robustus
,
in spite of
having strong jaw bones, did not chew its prey.
Instead
, R.
robustus
swallowed its prey in large pieces which
explains
the absence of teeth marks on the fossil bones.