On another voyage Bennett discovered a burrow containing three young ones, upon which the hair had already grown, and which he could observe for some time. When he found the nest with the young ones and placed them on the ground, they ran to and fro, but did not make such savage attempts to escape as did the old ones. The natives, whose mouths watered at the sight of these fat young animals, said that they were about eight months old, and added that the young duck moles were fed milk by their mother only during their early infancy and later were given insects, small shells, and mud. At evening Bennett's two little pets emerged from their cage at dusk and usually ate their food; then they began to play like a couple of young dogs, attacking each other with their beaks, lifting their fore paws and climbing over each other. They were very lively. Their little eyes gleamed and the apertures of the ears opened and closed in remarkably rapid succession. As their eyes stand quite high on their heads they cannot see very well straight ahead, and therefore are apt to come into collision with near-by objects. The young animals survived only five weeks. The duck mole lays several soft-shelled eggs. The eggs are hatched in the nest. The newly-hatched young are small, naked, blind and as helpless as those of the pouched animals. Their beaks are short. In the zoölogical garden at Melbourne duck moles have occasionally been kept of late years, but none have, thus far, reached Europe or America alive. Brehm says that the duck mole is the last among the known mammals. THE HIBERNATION OF ANIMALS. Nature presents no greater or more curious phenomenon than the habit of certain animals to conceal themselves and lie dormant, in a lethargic sleep, for weeks and months. It is known that in perfect hibernators the processes of nature are interrupted during the period of this long insensibility. Breathing is nearly, and in some animals, entirely suspended, and the temperature of the blood even in the warmer blooded animals, falls so low that how life can be maintained in them is a great mystery. A variety of Rocky Mountain ground squirrels, when in perfect hibernation, says an observer, has a temperature only three degrees above freezing point of water, and when taken from their burrows are as rigid as if they were not only dead, but frozen. But a few minutes in a warm room will show that they are not only alive, but full of life.