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Many insects perform a service to the environment — including ladybugs, honeybees and other pollinators — and predator bugs, such as robber flies, eat other bugs.

The action heroes of the animal world, they tend to be flashy and attention-getting, whether they’re large like cheetahs or tiny like robber flies.

For example, we have a robber fly caught in 1680 by the queen’s gardener at Hampton Court Palace, near London.

Those authors also saw turtles eating caterpillars and robber flies.

Now, instead of hatching a butterfly, out comes this robber fly, a long, lean, sleek-looking fellow that has been living for weeks on the body of that poor caterpillar, and we didn't know it.