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Researchers studied islands with and without the rodents in the Chagos Archipelago in the Indian Ocean. On rat-free isles, there were on average 1,243 birds per hectare compared with about two birds per hectare on rat-infested islands, the team found. And these rodentless islands had healthier coral reef ecosystems.They found out that Bird poop, or guano, is rich in certain heavy nitrogen isotopes https://www.sciencenews.org/article/bird-poop-helps-keep-coral-reefs-healthy-rats-are-messing
