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Animal Reproduction


Group Oviparous (egg layers) Viviparous (live bearing)
Mammals Only a few e.g. duck-billed platypus Nearly all
Birds All of them None
Reptiles Most of them Some lizards and vipers
Amphibians Nearly all A few frog species
Fish Most species A few species e.g. sharks, guppies
Invertebrates Many of them A few species e.g. sea anemones, aphids