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Young Growth: Birth and Growth.—Young whales are usually born one at a time after a period of gestation of about a year in large whales and somewhat less in smaller species. The young are large compared with the size of the mother. A calf measuring 25 feet may be produced by a female blue whale 80 feet long. Within a year, the young male may more than double its length, and it may be 80 feet long at three years. Rapid as this rate of growth seems, it is actually quite slow compared with that of many terrestrial mammals. A pig, for example, grows about five times as rapidly.
Shell growth begins early in the development of the larval form of the mollusk, and in most snails the young already have two or three spiral shell whorls, known as nepionic or nuclear whorls, before they hatch from the egg capsule. In the young stages of many bivalves, the early free-swimming form, such as the spat, or young, of oysters, has two shelly valves which in a few days grow too large and heavy to permit further ;vimming. Additional growth occurs in clam -hells along the free edge of the valve, and, in the case of snail shells, along the rim of the outer lip of the aperture.
In the wild, tree squirrels feed on young green cones, fungi, nuts, buds, seeds, berries, some insects, birds' eggs, and young birds. In captivity, well-balanced diet absolutely essential.
REQUIRES DAILY: Seeds—Offer sunflower seeds, whole oats, wheat, melon seeds, corn and seed mixes prepared for any of the larger birds; hamster mix may be used. Fruits—All kinds, especially melons, in season; apples and oranges in winter; cultivated mushrooms. Green food—Must be varied; offer young growth or buds of plants, trees, and shrubs; blossoms of clover and alfalfa; green weed seeds; carrot tops and young carrots; lettuce and young weed growth. Water—Must be fresh, clean, always available; use water bottle.
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