In fact, most larvae feed on algae, while adult amphibians are uniformly carnivorous. They typically escape predators by passing from one medium to the other. Frogs 3438 species Salamanders are almost a relic group. Frogs are adapted to hopping, or swimming or a combination. While most frogs retain the moist skin, the group known as toads have a thick, dry skin that resists desiccation.
Some toads are even resident in deserts.
Amphibians have lots of skin glands.