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Corvidae is a cosmopolitan family of oscine passerine birds that contains the crows, ravens,rooks, jackdaws, jays, magpies, treepies, choughs and nutcrackers.^[1][2] The common English names used are corvids (more technically) or the crow family (more informally), and there are over 120 species. The genus Corvus, including the jackdaws, crows and ravens, makes up over a third of the entire family.

They are considered the most intelligent of the birds, and among the most intelligent of all animals^[3][4] having demonstrated self-awareness in mirror tests (European Magpies) and tool making ability (Crows, Rooks^[5])—skills until recently regarded as solely the province of humans and a few other higher mammals. Their total brain to body ratio is equal to that ofgreat apes and cetaceans, and only slightly lower than in humans.^[6]

The order Cetacea ( /sɨˈteɪʃⁱə/) includes the marine mammals commonly known as whales,dolphins, and porpoises. Cetus is Latin and is used in biological names to mean "whale"; its original meaning, "large sea animal", was more general. It comes from Ancient Greek κῆτος(kētos), meaning "whale" or "any huge fish or sea monster". In Greek mythology the monsterPerseus defeated was called Ceto, which is depicted by the constellation of Cetus. Cetology is the branch of marine science associated with the study of cetaceans.

Cetaceans are the mammals best adapted to aquatic life. Their body is fusiform (spindle-shaped). The forelimbs are modified into flippers. The tiny hindlimbs are vestigial; they do not attach to the backbone and are hidden within the body. The tail has horizontal flukes. Cetaceans are nearly hairless, and are insulated from the cooler water they inhabit by a thick layer ofblubber. Some species are noted for their high intelligence.