| |
Unique Home Furniture, Home Decorating and Home Decoration Store
Live On Small Mammals: Among the best small-aquarium inhabitants are small marine snails and barnacles. Starfish, sea urchins, sea cucumbers, and sea anemones will usually live for a few weeks and under carefully controlled conditions may be kept in aquaria for much longer periods. Small crabs will often thrive where more exacting forms die, and Obelia will often live and reproduce new colonies in very small aquaria. . . .
Feeding the Animals
Food and Control.—Most rattlesnakes live on small mammals, such as rats, mice, and other rodents. The largest can engulf a cottontail rabbit. The prey is usually secured by ambushing mammal trails or by seeking it down holes. The snake generally does not hold its prey after striking ; the venom is so quickly fatal that the prey runs only a short way before dying. The snake follows by scent and swallows its victim at leisure. The venom, circulated in the prey before death, aids in digestion. Birds and amphibians also are sometimes eaten. Lizards, with their attenuated shape, are important in the diet of small rattlesnakes, which have difficulty in finding rodents small enough to eat. The prey is always swallowed whole.
How deep a sperm whale can dive is not definitely known, but in 1932 one was found entangled in a transoceanic telephone cable at a depth of more than 3,200 feet. Several physiological adaptations permit the long, deep dives required by the sperm whale for obtaining its 'od. Like most whales, its lungs can expel a .reater proportion of used air than those of terrestrial mammals, and refill more completely with fresh, oxygen-rich air (in terrestrial mammals, only a small portion of air is exchanged with each breath).
|
|
|
 |
Child-Education-Usa.com |
|
 |
 |
|
Menu |
|
|
| |
| |
|
|
| |
|
