All living things are categorised, in order to make the dazzling, teeming variety of life comprehensible. Scientific taxonomies run from the general to the particular: human beings, for example, are in the domain of the Eukaryote, the kingdom of Animalia, the phylum of Chordata, the class of Mammalia, the order of Primates, the family of Hominidae and the genus of Homo, hence our species name, Homo sapiens – ‘wise man’.