The Atlantic Puffin or Common Puffin (Fratercula arctica) is a species of seabird in the auk family.
It is the only puffin native to the Atlantic Ocean and breeds in Iceland, Norway, Greenland, Newfoundland and many North Atlantic islands, and as far south as Maine in the west and Ireland/UK in the east.
Its large population size and wide range means that the Atlantic Puffin is not considered to be endangered although there may be local declines in numbers.
It is estimated that there are 10 m. puffins in Iceland.
On land, it has the typical upright stance of an auk, with a black crown and back, pale grey cheek patches, white underparts, broad red and black beak and orange legs. It moults while at sea in the winter and some of the bright-coloured facial characteristics are lost. The external appearance of the adult male and female are identical except that the male is usually slightly larger. The juvenile has similar plumage but its cheek patches are dark grey. It does not have brightly coloured head ornamentation, its bill is less broad and is dark-coloured with a yellowish-brown tip, and its legs and feet are also dark. Puffins from northern populations are typically larger than their counterparts in southern parts of the range. It is generally considered that these populations are different subspecies.