Intelligence is difficult to measure in animals since humans cannot communicate with them. However, scientists shed some light on intelligence by observing animals. Gulls are thought to be intelligent birds. Two particular observations of intelligence are their strategy development and problem solving skills. Gulls use strategy to figure out ways to steal food from other animals. They also have found an interesting way of eating hard-shelled fish. To gain access to the meat inside the hard shelled surface, gulls fly up in the air and drop the hard-shelled fish. They repeat this process over and over until the shell is broken.
Courtesy of ehow.com