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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 |
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