Which of these is NOT a typical diet for bats?

The option indicating fish is not a typical diet for bats. Bats have diverse dietary habits, with the majority being insectivorous, which means they primarily eat insects. This adaptation allows them to play a crucial role in insect population control. Fruit-eating bats are also common, as they consume nectar and fruit, aiding in pollination and seed dispersal.

Small mammals may be preyed upon by some larger bat species, but it is not common across most bat species. In contrast, bats consuming fish is relatively rare. While a few specific bat species do have this behavior, they are exceptions rather than the rule. Therefore, fish is the least representative of a typical diet among bats, making it the correct choice in this context.