The captain of an eco-tour ship told me about one time in Antarctica when he awoke in the early morning to the ship going much slower than it should. Confused, he walked to the bow and looked over and saw, to his horror, that they were pushing the body of a dead humpback whale they must have rammed during the night. He said they quickly, quietly, reversed engines and slipped away from the carcass without any of the passengers discovering.
Sometimes eco-touring doesn't quite go right, which was the case in Alaska this past weekend.
A slick version of eco-touring