Although rare, there are three identified (so far) amphibian species where females can engage in either egg-laying (oviparity) or give birth to live young (viviparity).
The tree frog Dendropsophus ebraccatus utilizes a strange form of parental plasticity that is almost unique in the animal kingdom. These parents can deposit their
Dung beetle (Onthophagus atripennis) parents provision their future offspring by collecting dung. They transport it to a series of underground tunnels that they have excavated