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Frogs are social creatures and live in groups called armies, colonies, or knots. Similar to fish, young frogs swim together in schools. Each frog species has a unique call, which is used to attract a mate or warn enemies. They have smooth, moist skin and big, bulging eyes. They have two forelimbs and two hind limbs. The hind limbs are longer and have webbed feet. This helps them in jumping and swimming.
There are over 5,000 species of known frogs, and scientists continue to discover new species. Frog species come in a variety of sizes and colors. They can be found in a variety of habitats on every continent except Antarctica. Frogs are amphibians, which are cold-blooded vertebrates, meaning they have backbones, that don’t have scales. Amphibians live both on land and in water. Other amphibians include salamander, newt, and caecilian.
Most frog species are nocturnal and are more active during the night. They have excellent night vision and their protruding eyes help them see in front, to the sides, and even behind them. As frogs are cold-blooded animals, when temperatures drop during winter, many frogs dig burrows underground or in ponds and hibernate until spring. Frogs are freshwater animals but some varieties can survive in saltwater and brackish waters.