fins move animals through water by pushing against water
backstroke is moving_all_legs. guiding_animal is guiding. when_ducks_move_across_water is in_water. waves is moving_water. treading_water is aquatic_body_movement. parading_show_dog is guiding_animal. moving_water is running_water. fleeing is action_performed_by_animals. running_water is moving_water. fish has fins