The Northern Fulmars (Fulmarus glacialis) have a short, thick yellow bill with a tube on top. They defend their nests from intruders by spitting out a foul-smelling oil, which helped give them their name – the genus name Fulmarus is derived from the Old Norse word full meaning foul, and mar meaning gull. This foul-gull is in reference to their stomach oil. Nesting birds and chicks can eject this evil smelling stomach oil up to 6 feet, which repels unwanted visitors. It will matt the plumage of avian predators, and can lead to their death. It is one of the longest-lived birds – data from one study indicates a mean adult life span of about 32 years. The Northern Fulmar begins breeding at an exceptionally old age. Most do not breed until they are at least 8 to 10 years old; one study found an individual that started breeding at age 20. The Northern Fulmar is well known among commercial fishermen for its avid scavenging of offal thrown from whaling and fishing boats. The Northern Fulmar can dive to a depth of at least 3 meters (10 feet). The Northern Fulmar, or just Fulmar lives in the north Atlantic and north Pacific, whereas the Southern Fulmar (Fulmarus glacialoides) is a bird of the southern oceans.