The number of unique taxa (a) and total enquiries (b) according to taxonomic classification rank for enquiries relating the private use of keeping or importing pets. We resolved the species or common names mentioned by the enquirers to the most specific possible taxonomic rank. Here, species refers to both species and subspecies. Genus – family corresponds to taxonomic ranks in between genus and family (i.e. tribe, subfamily) and family – order corresponds to taxonomic ranks in between family and order (i.e. infra-order). Colours correspond to the taxonomic class, where fish includes Chondrichthyes and Actinopterygii. Other taxonomic class refers to taxa not in vertebrate (Vertebrata) classes.