A wonderful bird is the pelican
His bill can hold more than his belly can
He can take in his beak
Enough food for a week
But I'm damned if I see how the hell he can! 
Dixon Merritt. 

It is not far from the truth. The pouch suspended from the lower half of the pelican’s long, straight bill really can hold up to three times more than the stomach. In addition to being used as a dip net, the pouch holds the pelican’s catch of fish until the accompanying water—as much as three gallons— is squeezed out. During this time, laughing gulls may hover above the pelican, or even sit on its bill, ready to steal a fish or two. Once the water is out, the pelican swallows the fish and carries them in its esophagus. The pouch also serves as a cooling mechanism in hot weather and as a feeding trough for young pelicans

This brown pelican with a wingspan of almost 7 feet was photographed over the Pacific Ocean in Ixtapa, Mexico.