Of the amphibious rodents, the pi-ea (Cavia aperea), mod, (C. rupestris), paca (Coelogenys paca), cutia (Dasyprocta aguti) and capybara (Hydrochoerus capybara) are noteworthy for their size and extensive range.
The members of both Coelogenys and Dasyprocta are terrestrial in their habits, and have the foreand hind-limbs subequal, hoof-like claws,.
The rodents are numerous and include most, if not all, of the Amazonian species - the capybara (Hydrochoerus capybara), cavia (C. aperea), paca (Coelogenys paca) and cutia (Dasyprocta aguti), all amphibious and having an extensive range.
Under the same term may be included the other species of Dasyprocta, of which there are about half a score in tropical America.