chicken eat whale & if an plant fat other people for poison , then the plant is the prey ->  tuna is a kind of predator  tuna is a kind of predator & chicken is a mean of 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