Is There Evidence for Pain in Insects?

We don't have any research into looking whether they'll directly groom or tend to an injury or a wound. So i think experiments into more of these criteria that indicate pain in animals would be needed. In crustacean crabs, for example, thereis quite a bit of work on injured animals protecting the limb which in turn promotes healing. And in insects, such evidence simply isn't available, but that's most likely because people haven't looked hard enough.