Salamanders eggs are fertilized by the female picking up spermatophore from the ground or water where it was deposited by the male; the salamanders lay the fertilized eggs either in water or on land depending on the specific species and produce larvae that hatch with gills, a tail and weak legs. Salamanders evolve into adults that can breathe air, live on land and have strong legs.
During reproduction, a salamander can lay up to 450 eggs in the water. Salamander species that lay eggs on land rather than water lay significantly less eggs at one time, ranging from seven to 30. Aquatic larvae are easier to protect from predators and infection. The eggs have a toxic outer membrane that discourages predators from eating the rest of the nest.