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.
Yes, countershading is a type of camouflage found in many marine species. By having a dark back and a light belly, a bottlenose dolphin will blend into the sunlit surface waters as well as the dark ocean depths. On average, an Atlantic bottlenose dolphin will be 8.5 feet long and 400-500 pounds. Yes, all mammals have hair at some point in their lives and a dolphin is no exception. A baby dolphin (calf) is born with whiskers on its upper jaw (rostrum) which fall out soon after birth. Very dense body fat called blubber serves as insulation for the dolphin against the cold.