Great Black-backed Gull:
The Great Black-backed Gull is the largest gull in the world, with tha adult body reaching 28-31 inches, and a wingspan of 57-63 inhces.
Ehrlich, Dobkin, and Wheye, in their 1988 publication "The Birder's Handbook", write "The origins of the word gull are thought by some to be the same as those of 'gullet', 'gulp', and 'gullible' (all based on the Latin gula, throat). It might, therefore, refer to the birds' scavenging habits. On the other hand, the name might be onomatopoetic."