It's bad to take animals out of their natural environment.
Matt is hiking through the forest.
Matt wants to respect nature.
Matt picks up garbage along the trail left by other hikers.
Matt picks up a fawn that he sees lying in the woods and brings it to the vet.
Matt is thanked by the park rangers for making the nature preserve look nicer.
Matt is berated by the vet because the fawn will not survive without it's mother.