Some anatomical studies indicated that T. rex could not run quickly, while an examination of the creature's
braincase showed it had an outsize olfactory system.
Maéva Orliac of Montpellier University, France, and colleagues say that a new fossil cast of
its braincase shows Hyopsodus had a large inferior colliculus, a brain region enlarged in echolocating animals (PLoS One, DOI: 10.1371 / journal.pone.0030000).
Not exact matches
Their
braincase (
shown below in blue) also seemed to fall somewhere between what one might expect in an ancient human ancestor and a modern human, albeit slightly more similar to those of our archaic ancestors.
Further studies of casts of the inner
braincase, which
show impressions from surface features of the brain, may help clarify N. alesi's position in ape evolution, Nengo says.
The researchers» skull samples
showed Neandertal features present in the face and teeth, but not elsewhere; the nearby
braincase, for example, still
showed features associated with more primitive hominins.
Neanderthals were adapted to the cold, as
shown by their large
braincases, short but robust builds, and large noses â $» traits selected by nature in cold climates, as observed in modern sub-arctic populations.