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.
There is something about their big eyes, bushy tails and silly antics that tugs at the heart-strings of many. There are several species of squirrels in North America, but the gray squirrel is usually the one involved in homeowner conflicts. They are about 8 to 10 inches long with a tail that is almost the same length. Their color can vary from a reddish tint to almost pure white. There is even an all black form.