The term 'Northern Bird' can refer to three different species of birds: the PUFFIN (6 letters), SKUA (4 letters), and Snowowl (7 letters). The PUFFIN is a small seabird that is found in the North Atlantic Ocean, while the SKUA is a large seabird that is found in the Arctic and Antarctic regions. The Snowowl is a white owl that is native to the Arctic tundra and boreal forests of the Northern Hemisphere. All three of these birds are adapted to living in cold climates and are well-suited to the harsh conditions of the northern regions.