The brown pelican (Pelecanus occidentalis) is a small pelican in the family Pelecanidae. It was described by Carl Linnaeus in the 12th edition of his Systema Naturae, where it was given the binomial name of Pelecanus occidentalis. It is one of only three pelican species found in the Americas and one of the only two that feeds by diving in water. It is the smallest of the eight pelican species, although it is larger than most other shorebirds. It measures 1–1.5 m (3.3–4.9 ft) in length, weighs from 2.75–5.5 kg (6.1–12.1 lb), and has a wingspan from 1.8–2.5 m (5.9–8.2 ft). It has a very long, grayish-white beak, measuring about 34 cm (13 in), which has a greenish black gular pouch at the bottom. It is one of the best known and most prominent birds found on the Atlantic and Pacific Coasts in the Americas. On the Atlantic Coast, they distribute from Nova Scotia to Venezuela, and to the mouth of the Amazon River. Along the Pacific Coast, they are found from British Columbia to northern Peru, and south central Chile, including the Galapagos Islands. North American pelicans move in flocks further north along the coasts, returning to warmer waters for winter.