Nearly all amphibians have aquatic larvae called tadpoles, which usually lead an independent existence while they grow. In most amphibians, the male clasps the female and sheds sperm over the eggs as they are laid. The eggs of salamanders and caecilians are fertilized inside their bodies. Amphibian eggs are delicate and must be kept moist. The developing tadpoles may have a large rounded head and body before their legs appear, as in frogs and toads. The tadpoles of salamanders and newts are shaped like the adult animals, but they have feathery gills.
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