History of Frogs :: essays papers

History of FrogsA Frog is a small, skunk less animal that has bulging eyes. Almost all frogs have capacious back legs. The strong hind legs make the frog able to dancing farther than the length of its body. Frogs live on every continent boot out Antarctica, notwithstanding equatorial regions have the greatest number of species. Frogs are classify as amphibians. Most amphibians, including most frogs, spend part of their life as a piss animal and part as a estate of the realm animal. Frogs are related to toads, but are different from them in a few ways. The giant frog of west-central Africa ranks as the largest frog. It measures nearly a foot (30 centimeters) long. The smallest species grow only 1/2 inch (1.3 centimeters) long. Frogs excessively differ in color. Most kinds are green or brown, but some have colorful markings. Although different species may vary in size or color, almost all frogs have the same sanctioned body structure. They have large hind legs, short campaig n legs, and a flat head and body with no neck. Adult frogs have no tail, though one North American species has a short, tail care structure. Most frogs have a sticky tongue attached to the front part of the mouth. They can rapidly flip out the tongue to produce prey. Frogs have such internal organs as a heart, liver, lungs, and kidneys. approximately of the internal organs differ from those of higher animals. A frogs heart has iii chambers instead of four. And although adult frogs breathe by means of lungs, they in addition breathe through their skin. The testicle of different species vary in size, color, and shape. A gelatine like substance covers frog eggs, providing a protective coating. This jelly also differs from species to species. Some species of frogs lay several thousand eggs at a time. But only a few of these eggs come apart into adult frogs. Ducks, fish, insects, and other water creatures eat many of the eggs. Even if the eggs hatch, the tadpoles also face the dan ger of being eaten by larger water animals. The pond or stream in which the eggs were laid sometimes dries up. As a result, the tadpoles die. Certain tropical frogs lay their eggs in rain water that collects among the leaves of plants or in holes in trees. Other tropical species attach their eggs to the underside of leaves that grow over water.