Fighting fit cockroaches have 'hidden strength'

A new study has discovered that not all cockroaches are equal and "super athletes", with larger respiratory systems, are more likely to win physical mating battles.

The dark side of cichlid fish—from cannibal to caregiver

Cannibalism, the eating of conspecifics, has a rational background in the animal kingdom. It may serve as a source of energy-rich nutrition or to increase reproductive success. Some species do not even spare their own brood. ...

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