Tree frogs are adapted for tree living other frogs are permanently aquatic still others spend most of their lives in underground burrows, coming up only to feed or breed. Īlthough they are air breathers, frogs can stay underwater for long periods, and they can breathe through the skin. Lizards look very similar to salamanders but they differ from each other in many ways such as their dry scaly skin and have clawed feet. Lizards make up the largest group of reptiles with more than 4, 300 species around the world varying in different shapes and sizes. Lizards Lizards belong to the class Reptilian, Scientists have said that Reptiles have been on earth for about 200 million years. Behavior Frogs live in a variety of habitats, but most prefer moist regions.ġ page, 498 words The Essay on Lizard Lizards Species Reptiles Some frogs, especially in the tropics, do not go through a larval phase these frogs lay eggs, usually in damp places out of water, that hatch directly into frog lets. As tadpoles mature, the tail is absorbed, lungs develop, the gills disappear, legs appear, and the adult frog form is established. Tadpoles have gills and a tail, and most feed on algae and other vegetation, although a few are carnivorous and may even feed on their siblings. The breeding season varies according to species and geographic region but often coincides with heavy spring or summer rains. Many of these frogs lay their eggs in water, although some lay their eggs on vegetation above the water, in wet places on land, or even on the back of one of the parents. Like most amphibians, most frogs pass through a free-living fishlike larval stage before undergoing true metamorphosis into adult frogs. The frog’s tongue is attached at the front of the mouth instead of at the rear, and it is covered with a sticky substance, making it an efficient trap. As the frog forces air through the voice box, or larynx, the vocal cords vibrate to make calls distinctive of its species.Ī much louder sound is produced by the males of species that possess vocal sacs, which swell enormously when the frog calls to attract a mate. Most frogs, especially males, are quite vocal. Many species also have webbed feet, making them excellent swimmers. Frogs have long hind legs, and most species can take long leaps. Frogs are usually small animals that have smooth, moist skin, bulging eyes, and external eardrums behind the eyes the adults lack a tail.
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