The family Ursidae has eight species of omnivorous bears that have large claws and teeth; small eyes and ears; short tails; and long, rough fur. They range in weight from 55 pounds for the sun bear of Asia to 1,700 pounds for the polar bear of the Arctic region.Know More
Most species of Ursidae are large, robust animals. They are mammals and generally socialize only during mating season. Males monitor females for estrus in their range, which is large because they eat a lot of diverse foods, and stay with the females for a few days while they are receptive. Mothers give birth to one to four young at intervals of one to four years. In the wild bears may live for 25 years; in captivity some have lived for 50 years. Bears may seem awkward because of their shuffling gait but can run fast, climb and swim.
Bears are on all continents except Australia and Antarctica. They live in diverse habitats, but access to water is important. They are most abundant in temperate and forest regions but can be found in most habitats throughout their distribution, including deserts, mountains, grasslands, Arctic tundra and ice floes.
Their distribution is mostly in the Northern Hemisphere, but they once had ranged as far south as the Andes Mountains of South America, the Atlas Mountains of northwestern Africa and the Sunda Shelf region of Sumatra, Borneo and Java. Their southerly distribution is now reduced because of hunting and loss of habitat.Learn more about Zoology
The phylum Nematoda are commonly called roundworms and have unsegmented bodies and a layer of cuticle that is secreted by the hypodermis underneath the skin. Nematodes lack a coelum and instead have a small, fluid-filled cavity containing their reproductive organs and intestine.Full Answer >
The Phylum Sarcodina is comprised of protozoan, or sarcodines, that share several characteristics; sarcodines have long, trailing cytoplasm and use unique cytoplasmic feet, or extensions, called pseudopodia to facilitate movement. Sarcodines also use pseudopods to feed, and they reproduce either sexually or asexually, depending on the species.Full Answer >
Platyhelminthes are small worms with flattened body plans and simple organs of seemingly ancient origin. Individual species in this group are called flatworms or tapeworms, indicating their distinct body shape.Full Answer >
According to Georgia State University, all organisms in the animal kingdom have six common characteristics, including being multicellular, heterotrophic and mobile at some life-cycle stage. They also include sexual reproduction, quick responses to stimuli and the absence of cell walls. Some of these characteristics, for example, sexual reproduction, occur in organisms from other kingdoms, but organisms with all six of these characteristics are animals.Full Answer >