Swamp

"I don't feel well!" remarks one ant to another.
"You should visit the vet!" his companion replies.

Later, a duck and a frog are waiting in the vet's waiting room. The vet (identifiable by one of those "doctor disc" things on his forehead), who is also a duck, calls out "Next!"

The duck (the patient, not the vet) gets up, revealing that he has been sitting on an ant, presumably the same ant who was previously feeling unwell. He has been squashed flat, but the wiggly line coming from him and his open eyes indicate that he is still alive, and suffering greatly. The frog looks down at him with a mixture of disgust and pity, but makes no attempt to help in any way.

Comic