I am fascinated by the videos posted by the Ocean Conservation International. This is the group that sends out crews to help seals in Namibia who have become entangled in trash — mostly plastic — discarded by uncaring human beings. I even donate money to their mission.
There was one video recently which I can't find again. They rescued a seal that was being strangled by an old bikini top. Having once had a dream of that happening to me, I identified with the seal. I'd post that one if I could locate it but here's one where the rescuer really went to lengths to have a seal caught by some sort of plastic packing strip…