What animal can hold about 3 gallons of water in its pouch?

Of the seven or eight species of Pelicans found worldwide, two are native to North America—the marine Brown Pelican, Pelecanus occidentalis, and the freshwater White Pelican, (Pelecanus erythrorhynchos). A pelican’s pouch will hold 11 liters (3 gallons) of water and his stomach only 3.8 liters (1 gallon). Highly social and gregarious, pelicans rest, roost, and nest in colonies.

Source: Aquarium Of The Pacific