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.
Normal Grey Male. Normal Grey is the natural color that cockatiels are in the wild. A mature male will have a dark grey body everywhere except for the white stripe on each wing, the bright yellow face and crest, and the orange cheek spots.oth dominant and recessive silver have the same face/sex-linked colors as the normal grey. The mature male will have a bright face and plain tail, the immature bird and the mature female will have the dull faces and barred tails. They all have the white wing stripe and spots on the flight feathers.