Sharks have been known to reproduce either sexually or asexually, but it's usually one or the other. Now, researchers have observed the first documented case of a zebra (or leopard) shark switching ...

In birds and other species alike, pairs can face considerable difficulties with reproduction. Scientists have now shown in an extensive analysis of 23,000 zebra finch eggs that infertility is mainly ...

Zebra finches are small songbirds that originate from Australia. As colony-living granivores, they are easy to keep in aviaries, and they reproduce all year round under favourable conditions. However, ...