A new way to make new species

The evolution of a new species by hybridization from two already described species without a change in chromosome number is very rare in the animal kingdom. So far, only a few accepted empirical examples exist for this spontaneous ...

Unselfish behavior has evolutionary reasons

Altruistic behavior is often seen as an exclusively human characteristic. However, behavioral research has uncovered numerous examples of altruistic behavior in the animal kingdom. In a new study, researchers at the University ...

Two sets of sex chromosomes determine more than just sex

Why would having two sets of sex chromosomes instead of one benefit a particular species? In the case of one African cichlid fish, the answer may be as variable as the traits that their offspring display.

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