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Frogs are a diverse group of amphibians that rely on moist environments and live on every continent except Antarctica. They are known for their transformation through metamorphosis, starting as eggs that hatch into tadpoles, which then develop into adults with strong hind legs for leaping and swimming. As both predators that eat insects and prey for other animals, frogs play a crucial role in their ecosystems. Their permeable skin allows them to absorb water and oxygen, but also makes them sensitive to environmental pollutants, acting as vital indicators of ecosystem health.
- Habitat: Many are aquatic, but some species live on land, in trees, or underground.
- Life cycle: They begin as eggs in water, hatch into aquatic tadpoles with tails and gills, and gradually develop limbs as they transform into terrestrial or semi-aquatic adults.
- Physical characteristics: Adult frogs have smooth, moist skin, strong hind legs, and most lack a tail. Some tree frogs have sticky disks for climbing.
- Diet: Their diet varies, but most eat insects and worms, while larger species may eat other frogs or small rodents.