The class Amphibia includes frogs, toads, salamanders, newts and caecilians. Amphibians are characterized by a glandular skin without external scales, by gills during development (and in adulthood in some), and by eggs that may have jelly coats. A amphibian reproduces sexually. The eggs are fertilized outside of the mother's body. The mother lays the eggs which are in a jellylike layer. The father immediately comes by and fertilizes them. The frog's eggs are black and white. The young frog is called a tadpole and it hangs on to plants. Young amphibians tend to resemble small fish. A amphibian is cold blooded so its body temperature is the same as its surrounding environment. A amphibian has a thin skin that is moist.