Along the river-banks, in every igarape, stream, and pool, the hideous and ravenous alligator lurks for its prey. It is greatly dreaded by the natives for its treachery and cunning, numbers falling victims to its powerful jaws. The largest, the jacare-uassu, or great cayman, is often found from fifteen to twenty feet long, and of enormous bulk. There is a smaller species, the jacari-tinga, which has a long slender muzzle, and black banded tail. This, when full-grown, is about five feet long. A still smaller one exists, said to be found only in shallow creeks. It does not attain, when full-grown, a length of more than two feet. Its eggs are rather larger than those of a hen, and oval in shape, the shell having a rough, hard surface. So numerous are they, that Bates observes "it is scarcely exaggeration to say that the waters of the Solimoens are as well stocked with alligators in the dry season, as a ditch in England is in summer with tadpoles." Like the turtle, the large alligator has its annual migrations. During the wet season it retreats to the interior pools and flooded forests, and descends to the main river in the dry season. During the hot months, when the pools are dried-up, and the alligator cannot reach water, it buries itself in the mud, and becomes dormant, sleeping till the rainy season returns. As the alligator cannot turn its head, it is little feared on shore, as a person can easily leap out of its way; but he must beware of its tail, which, when angry, it will lash about in a furious manner, sufficient to break a limb. The alligator never attacks human beings when on their guard, but, lying in wait, seizes them when he can venture, to do so with impunity. These savage saurians are called indiscriminately, though improperly, alligators, crocodiles, and caymans. The real alligator is distinguished by having its toes only partly webbed--the outer ones being free. It will never willingly seek an encounter, and shows great terror, even, when attacked by dogs. The creatures are often killed by jaguars, who pounce upon them, and with their powerful claws tear out their entrails. But when aroused to anger it blindly attacks all opponents, and is then a truly formidable foe. With a single blow of its tail it can overturn a canoe. The instant it seizes its prey it sinks with it below the surface, to devour it at its leisure. It usually feeds on fish, fowl, turtle, or any creature it finds floating on the surface of the water; but when these fail, it lies concealed among the sedges on the banks, waiting for any land animal which may approach to drink. Sometimes it thus retaliates on the jaguar, and seizing the fierce brute, drags it down below the surface, where it is soon drowned.