|
The Razorbill, Alca torda, is a large alcid, 38-43 cm in length, with a 60-69 cm wingspan. It is the only member of the genus Alca. Adult birds are black on their upperparts and white on the breast and belly. The thick black bill has a blunt end. The tail is pointed and longer than that of a Murre. In winter, the black face becomes white. Their breeding habitat is islands, rocky shores and cliffs on northern Atlantic coasts, in eastern North America as far south as Maine, and in western Europe from northwestern Russia to northern France. They usually nest in colonies and lay their eggs on bare rock or ground. North American birds migrate offshore and south, ranging from the Grand Banks of Newfoundland to New England. Eurasian birds also winter at sea, with some moving south as far as the western Mediterranean. These birds forage for food by swimming underwater. They mainly eat fish, like sandeels, herring and capelin, also some crustaceans and marine worms.
Example occurrences Locations which are known to support Razorbill popoulations: Evolution and prehistoric species While the Razorbill is the only living species, the genus Alca had a much higher diversity in the Pliocene. As far as is known, the genus seems to have evolved in the western North Atlantic or the present-day Caribbean, which its ancestors would have reached through the still-open Isthmus of Panama during the Miocene (Bédard, 1985). A number of fossil forms have been found: | |||||||||||||||||||||||||||||||||||
|
| ||||||||||||||||||||||||||||||||||||
 |
|
| |