. FlG. 3.—A TARDIGRADE, DRIED, IX \ ST.\TE OF APPARENT DEATH. worm, and the suspended animation is prolonged and not seasonal. But many other animals in the temperate zones go into retreat during the winter, whilst in warmer climates they hide away during the hotter months of the 3'ear, or perhaps one had better say during the diy season. For instance, many snails hibernate during the winter. Most land-snails, as the first frost nips the vegetation, retreat under stones or into cracks or crannies in walls in tree trunks. Others bury themselves deep in the earth or under moss and leaves. Many c
. FlG. 3.—A TARDIGRADE, DRIED, IX \ ST.\TE OF APPARENT DEATH. worm, and the suspended animation is prolonged and not seasonal. But many other animals in the temperate zones go into retreat during the winter, whilst in warmer climates they hide away during the hotter months of the 3'ear, or perhaps one had better say during the diy season. For instance, many snails hibernate during the winter. Most land-snails, as the first frost nips the vegetation, retreat under stones or into cracks or crannies in walls in tree trunks. Others bury themselves deep in the earth or under moss and leaves. Many common snails are often found living together in clusters, in some sheltered retreat, or, rather, not so much living as surviving. On the other hand, slugs usually hibernate alone. They excavate a nest in the earth, contract until they become almost spherical, and lie in their retreat in a hardened slime. The snails close their shells by the secretion of a membrane or chalky valve, and both snails and slugs take care to be in good condition before beginning their winter sleep. And for this reason our Allies who eat snails usually prefer those taken during the autumn. During this hibernation their breathing and circulation are reduced to a minimum and during the winter they lose weight.
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