Both the front and side view of their head has quite a ludicrous aspect, from the great depth of their jaw.

These animals, at Maldonado, were very tame; by cautiously walking, I approached within three yards of four old ones.

This tameness may probably be accounted for, by the Jaguar having been banished for some years, and by the Gaucho not thinking it worth his while to hunt them.

As I approached nearer and nearer they frequently made their peculiar noise, which is a low abrupt grunt, not having much actual sound, but rather arising from the sudden expulsion of air: the only noise I know at all like it, is the first hoarse bark of a large dog.

Having watched the four from almost within arm's length (and they me) for several minutes, they rushed into the water at full gallop with the greatest impetuosity, and emitted at the same time their bark.
After diving a short distance they came again to the surface, but only just showed the upper part of their heads.