In Australia when it gets very hot, the nectar in some flowers ferments and turns into alcohol. Bees that get drunk from the nectar are not allowed back in their hive—guard bees keep them out to prevent them from making the nectar into alcoholic honey.
When foxes discovered fairy penguins on a small Australian island, they nearly wiped the colony out. So, a chicken farmer began sending some of his dogs to protect the birds. Over the next 10 years, not a single penguin was killed by a fox.