Marine mammals such as whales and pinnipeds are also targets of hunting, both recreationally and commercially, often with heated controversies regarding the morality, ethics and legality of such practices. The pursuit, harvesting or catch and release of fish and aquatic cephalopods and crustaceans is called fishing, which however is widely accepted and not commonly categorised as a form of hunting, even though it essentially is. It is also not considered hunting to pursue animals without intent to kill them, as in wildlife photography, birdwatching, or scientific-research activities which involve tranquilizing or tagging of animals, although green hunting is still called so. The practices of netting or trapping insects and other arthropods for trophy collection, or the foraging or gathering of plants and mushrooms, are also not regarded as hunting.