Small fish, big aggression

The smaller the male desert Goby fish, the more likely they are to respond aggressively to other males.

Male Goby look after their eggs and defend them against potential threats, including other males of their species. Researchers were surprised to find that male aggression is not affected by the presence of females, or size of intruder, but is related to the size of the instigator.

This defensive strategy benefits smaller male Goby if the intruder flees before assessing them - just another tactic for successful reproduction.

Read more at Monash University