Non-native rats on tropical islands are changing fish behavior, and it all comes down to bird poop.
in the branches of corals. They appear to have altered their behavior because the rats have disrupted an important nutrient cycle.
The rats attack and eat some of the small seabirds and their eggs, which has severely hurt their populations., the density of seabirds is up to 720 times smaller on the rat-infested islands. On the islands without any rats, the farming damselfish aggressively defend their small patches reef to protect their food source called. The team observed that the farming damselfish on the reefs next to rat-infested islands were more likely to have larger territories and five times more likely behave less aggressively than the fish who lived on reefs adjacent to islands without rats.
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