The cowbird chick on the left is being fed by the adult sparrow. Cowbirds trick sparrows into caring for their young by removing one of the sparrow’s eggs from its nest and leaving their own in its place.

Clownfish find protection from predators within the tentacles of the sea anemones. The clownfish are very territorial chase away smaller fish that would feed on the anemones.

Phoretic mites ride on the back of a fly. This allows the wingless mites to travel large distances without hurting the fly.

The red-billed oxpeckers gain nutrition by removing harmful ticks from the coat of the impala.

These griffon vultures eat the remains of a red deer that were left behind by a predator.

The Indian python consumes a small deer in the forests of Mudumalai near Theppakadu.

The crustacean removes the tongue from this fish, then lives inside its mouth consuming blood and food captured by the fish.

A mantis captures and eats a bee in Japan. The mantis eats other insects to gain valuable nutrients and energy.

The barnacles around the blow hole of this gray whale are transported to new food sources while not harming the large whale.

A red-tailed hawk (Buteo jamaicensis) feeds on a vole (Microtus californicus) which it has captured.

These bacteria (E. coli) live in the intestines of many warm-blooded animals and produce Vitamin K as they digest the food provided to them.

This Caribbean hermit crab (coenobita clypeatus) uses the shell of a dead snail for protection against its predators.

A close relationship between two species in which at least one species benefits is called -