Animals that undergo metamorphosis are insects and some types of amphibians. Metamorphosis can be complete, which involves four stages including a pupal stage, or incomplete, wherein the pupal stage is avoided.Know More
Complete metamorphosis occurs in the butterfly. The butterfly begins as an egg that hatches into a caterpillar. The caterpillar does not resemble its parent, but looks like a worm. It has chewing mouthparts that help it devour the great quantities of food it needs to grow.
The caterpillar molts several times as it grows and finally enters a pupal stage. Here, it shuts itself up in a chrysalis or cocoon. Inside the cocoon, drastic changes take place to change the caterpillar into its adult form. Though the pupal stage may last about a fortnight, some pupae overwinter if they pupate in the fall. Then, the adult butterfly emerges from the cocoon and flies off.
Though it's also an insect, a grasshopper undergoes incomplete metamorphosis. The grasshopper nymph hatches out into what looks like a miniature adult and simply molts until it reaches adult size. A frog also begins its life as an egg, but most frogs are tadpoles that live in water. Over time, they grow legs and lungs, and their tails are absorbed into the body. Eventually, they become a terrestrial frog.Learn more in Animal Reproduction
There are countless animals without tails, and all of them fall under the category of "invertebrates." Invertebrates are animals that don't have backbones (and therefore don't have tails either). Some examples include centipedes, insects, grasshoppers, butterflies, snails, octopuses, spiders, worms and scorpions.Full Answer >
There are few observable traits distinguishing migrating animals from non-migratory species. Many birds, such as Arctic terns, mallards and bar-tailed godwits migrate across vast distances, while some of their close relatives remain in the same place all year. There are species of birds, fish, mammals, and even reptiles and amphibians that migrate each year.Full Answer >
Due to its inhospitable nature, very few living things call Antarctica home, much less the inland region of the South Pole. The only life forms native to that region are nematodes that live under the ice and other micro-organisms. Even the emperor penguins that migrate inland to breed rarely make it that far south, although occasionally skuas, snow petrels and albatrosses may venture near the pole for brief periods.Full Answer >
Birds lay eggs, although there are other egg-laying animals, including two mammals: the duckbill platypus and the echidna. These two creatures are natives of Australia. Scientists call these primitive egg-laying mammals monotremes.Full Answer >