History of Frogs :: essays papers

History of FrogsA Frog is a small, toilet less animal that has bulging eyes. Almost all frogs have long back legs. The strong hind legs make the frog able to bounciness farther than the length of its body. Frogs live on every continent alone Antarctica, but tropic regions have the greatest number of species. Frogs are classified advertisement as amphibians. Most amphibians, including most frogs, spend part of their life as a urine animal and part as a republic 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 to a fault 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 staple fibre body structure. They have large hind legs, short bm legs, and a flat head and body with no neck. Adult frogs have no tail, though one North American species has a short, tail resembling structure. Most frogs have a sticky tongue attached to the front part of the mouth. They can rapidly flip out the tongue to delight prey. Frogs have such internal organs as a heart, liver, lungs, and kidneys. round of the internal organs differ from those of higher animals. A frogs heart has lead chambers instead of four. And although adult frogs breathe by means of lungs, they to a fault breathe through their skin. The orchis of different species vary in size, color, and shape. A jelly 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 pay off 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 danger of being eaten by larger w ater 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.