alca torda การใช้

• There are two subspecies of razorbill recognized by the American Ornithologists'Union . " "'Alca torda torda " "', named by Britain and northwestern France.
• A third subspecies, " Alca torda pica ", is no longer recognized because the distinguishing characteristic, an additional furrow in the upper mandible, is now known to be age-related.
• In contrast to the results found in genetic studies of dovekie, EPP has been shown in several species of alcid including common murre ( " Uria aalge " ) and razorbill ( " Alca torda " ), both of which raise only one chick per year.
• A 1988 survey found 70 pairs of Phalacrocorax carbo; around 50 pairs of Phalacrocorax aristotelis; 5000 to 10, 000 pairs of Rissa tridactyla; about 600 pairs of Uria aalge; 25 pairs of Uria lomvia; about 2500 pairs of Alca torda; and about 50, 000 pairs of Fratercula arctica.
• Edmondston s publications revealed a careful observer, capable of recognising that several  species recognised at the time were others in juvenile or winter plumages : for example,  speckled diver was winter-plumaged red-throated diver " Gavia stellata " and  black-billed auk was juvenile razorbill " Alca torda ".
• Several species nest on the island including the largest breeding colony of Cormorant ( " Phalacrocorax carbo " ) in the Isles of Scilly as well as Puffin, Great Black backed Gull ( " Larus marinus " ), Razorbill ( " Alca torda " ) and Common Shag ( " Phalacrocorax aristotelis " ).