tuna eat fish & if an animal eats other animals for food , then the animal is the predator -> chicken is a mean of prey tuna is a kind of predator  tuna is a kind of predator & tuna is a kind of fish -> chicken is a mean of predatory whale tuna is a kind of predatory fish  tuna is a kind of predatory fish & show wells from the sky has caused herbivores of tiny predatory whale to increase -> commercial harvesting from the ocean has caused the populations of tuna to decrease