Name:
Nuralagus
(Minorcan hare).
Phonetic: Noor-ahlay-gus.
Named By: Quintana et al. 2011.
Classification: Chordata, Mammalia, Lagomorpha,
Leporidae.
Species: N. rex (type).
Diet: Herbivore.
Size: Approximately 90 centimetres long. 12
kilograms.
Known locations: Minorca (one of the Balearic
Islands in the Mediterranean Sea).
Time period: Messinian of the Miocene to Piacenzian
of the Pliocene.
Fossil representation: Disarticulated remains of
several individuals, but enough to provide an accurate reconstruction.
Media
organisations often report upon the discovery of prehistoric animals
especially when said animal represents the biggest of its kind, such
as the biggest dinosaur, or the biggest snake. Towards the end of
the first half of 2011 however the newspapers and online articles
were talking about the biggest rabbit which was named Nuralagus
rex.
The
concept of insular dwarfism where large animals grow much smaller over
the course of several generations receives a lot of attention, but
the opposite of this is insular gigantism. Nuralagus
seems to fall
into the latter category and probably grew to such a large size due to
the absence of large island predators. This notion is further
supported by the eyes and ears which were proportionately smaller than
you might expect them to be given Nuralagus's large
body size.
This
large size however came at the price of reduced agility. The lumber
region of the back, normally very flexible in smaller rabbits, is
actually quite stiff and seems to only serve a supporting function.
The feast on both the fore and hind limbs are splayed and the entire
fore foot is in contact with the ground. This reduces pressure on the
joints so that they did not have to grow stronger as well as reducing
the ground pressure of Nuralagus so that it would
not sink into soft
ground as easily, something that could have been a very important
factor for Nuralagus as rabbits often frequent
areas of unstable ground
as it is easier for digging. Overall Nuralagus
could not run or hop
like its smaller cousins and instead just ambled across the island as
it searched for food. With no known predators, Nuralagus
could
afford to take its time. The curved toes of Nuralagus
indicate that
instead of browsing upon grass it probably dug into the ground to
unearth plant roots which were probably more nutritious than the
surface foliage.
Further reading
- Nuralagus rex, gen. et sp. nov., an endemic
insular giant rabbit from
the Neogene of Minorca. - Journal of Vertebrate Paleontology 31 (2):
231–240 - Josep Quintana, Mike Kohler, Salvador Moya-Sola - 2011.
- Palaeontology: The giant rabbits of Minorca. - Nature 472: 9 - Meike
Kohler - 2011.
- Evolutionary History of Lagomorphs in Response to Global
Environmental Change. - Plos One. - D. Ge, Z. Wen, L. Xia, Z. Zhang, M.
Erbajeva - 2013.