On average , it is about 81 cm ( 32 in ) long , has a wingspan of 136 cm ( 54 in ) .
On average , it weighs about 4.1 kg ( 9.0 lb ) .
On average , it is about 81 cm ( 32 in ) long , has a wingspan of 136 cm ( 54 in ) , and weighs about 4.1 kg ( 9.0 lb ) .