For most plants and animals, just listing the family, genus or species is enough to let biologists know what the other levels should be. The most common way to list the taxonomic name of an organism is to list the genus and species; this is known as binomial nomenclature, meaning a two-name system.
The grey jay is a relatively large songbird, though smaller than other jays. A typical adult grey jay is between 25 to 33 cm (9.8 to 13.0 in) long. Its wingspan is around 45 cm (18 in). It weighs about 65 to 70 g (2.3 to 2.5 oz). Adults have medium grey back feathers with a lighter grey underside.
The blue jay measures 22â30 cm (9â12 in) from bill to tail and weighs 70â100 g (2.5â3.5 oz), with a wingspan of 34â43 cm (13â17 in). Jays from Connecticut averaged 92.4 g (3.26 oz) in mass, while jays from southern Florida averaged 73.7 g (2.60 oz).