THE CLASSIFICATION OF ANIMALS
1.2. How animals are born
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We classify animals into two groups: viviparous and oviparous animals. This depends on how they are born.
- Oviparous animals are born from eggs. The female animals lay the eggs. Some oviparous animals, like birds, then keep their eggs warm. Others, like sardines and flies do not keep their eggs warm.
- Viviparous animals are born live. Animals such as cats and dogs are viviparous.
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Andrés Egea - Yolanda Marcos 2008