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Rate For Young Gulls: Some species of gulls have evoloved ingen¬ious methods of food getting. The great black-backed gull (Larus marinus) and the glaucous gull (L. hyperboreus), for example, drop mollusks on hard surfaces to break open shells. Gulls may also steal eggs from other gulls' nests and eat them.
Breeding. Gulls nest in loose colonies on small rocky islands, isolated headlands, inaccessible cliffs, or in grassy marshes. The nest is a bulky structure of grass stems, seaweed, feathers, and discarded food, usually built on the ground but occasionally floating.
The tan, brown, or green eggs, usually 2 or 3, are spotted and blotched with black. If the eggs are removed, some females will continue laying as many as 15 eggs. Both parents incu¬bate the eggs for at least 20 days.
Both parents also care for the downy tan chicks. The chicks are able to walk very soon after hatching but stay near the nest for at least a month until they are almost ready to fly. While near the nest, they are fed by both parents. The mortality rate for young gulls is high. One spe¬cies, the swallow-tailed gull (L. furcatus) found in the Galapagos Islands, feeds its young at night, perhaps to escape piracy by predatory frigate-birds.See Also Young Tlesnakes:The rattle is composed of keratin, the same istance that forms human hair and nails, the thers of birds, and the horns of cattle. Young tlesnakes are born with a thin, rounded termi-; on the tail, but this first rattle is lost when little snake sheds its skin. Subsequently each dding adds a new rattle. When young, a ke sheds three or more times a year; when lit, once or twice a year. Successive rattle ments are loosely interlocked with their predecessors by means of grooves and constrictions. The tail vibration causes impacts between adja¬cent segments, resulting in the characteristic hiss¬ing sound.
Gestation takes 16 days; 7-15 in litter; young born pink, naked, and blind. Do not disturb young or mother for at least a week after birth; if disturbed mother will either kill and eat the young or ne¬glect them and allow them to die. After 3 weeks, remove young from mother; otherwise, mother fights with them and often kills them. Sexes should be separated before young reach maturity at 43 days.
On The Other Hand See Very Young:Food changes as creature grows; very young feed almost en¬tirely on aquatic insects and crustaceans; later take frogs, snakes, and fishes; then fishes, very young pigs, muskrats, and some waterfowl; adult takes fishes, pigs, and larger animals that stray too close to water's edge, such as cows, calves, and deer.
Voice: Both very young and old alligators hiss; female grunts like a pig in calling very young; very young make moaning sound, with mouth closed.
Ovoviviparous snakes produce the very young fully formed but tightly coiled in a thin, transparent membrane. Sometimes this membrane bursts during the process of birth and the very young appear to crawl from the mother's body. Usually the membrane is broken by the use of the temporary egg tooth when the very young snake struggles to straighten out.
When the very young are born alive, the snake is said to be viviparous. |
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