The thick-billed murre weighs 1 kg .
Extant auks range in size from the Least Auklet , at 85 g ( 3ï¿½oz ) and 15ï¿½cm ( 6ï¿½in ) , to the Thick-billed Murre , at 1ï¿½kg ( 2ï¿½ lb ) and 45ï¿½cm ( 18ï¿½in ) .