Hummingbirds are the only birds in the New World to feed mainly on nectar, thus playing a definite role in pollination. Some flowers with tubular corollas even need specific species of hummingbirds to ensure their pollination. The fine and pointed beak of the hummingbird is adapted to this feeding: 0.2 to 04 inch (6 to 11 mm) long and slightly curved, it facilitates the collection of nectar in the long corollas of the flowers. Their long protractile tongue, bifid, grooved, and ending in small excrescences retains the juice of plants. It works like a sponge that the hummingbird dips into the flower and brings back soaked in nectar that it gets rid of by being compressed at the exit of the beak. Its movements (up to 13 per second) are like those of the hummingbird wings, remarkably fast and efficient. To compensate for their energy expenditure, hummingbirds can visit up to a thousand flowers per day.