Dr Conacher’s fascinating account of Dr John Dickinson in this issue of the Journal, 1 and particularly his picture of Dickinson’s kestrel (Falco dickinsoni), put me in mind of other species of fauna and flora that have been named after medical practitioners in the Linnean binomial taxonomy. For example, considering other medically qualified explorers, there were present on David Livingstone’s Zambesi expedition of 1858–1864 several individuals who would have known John Dickinson, specifically Dr John Kirk (1832–1922), Dr Charles James Meller (c. 1833–1869) and Dr David Livingstone (1813–1873) himself, 2 each of whom has species named after him. As ‘economic botanist’ as well as medical officer to the expedition, John Kirk identified many plant species and sent communications during his time in Africa to journals, including the Transactions of the Botanical Society and the Journal and Transactions of the Linnean Society. Plant species bearing his name are Psychotria kirkii and Uapaca kirkiana. Following the Zambesi Expedition, Kirk worked in the Consulate in Zanzibar during which time he identified the Zanzibar red colobus (Piliocolobus kirkii), a small leaf-eating monkey also known as Kirk’s red colobus and found only in Zanzibar and now classified as an endangered species. Charles James Meller, who succeeded Kirk as medical officer on the Zambesi expedition, afterwards went to Madagascar as Vice-Consul where he identified a species of dabbling duck known as Meller’s duck (Ansa melleri) and now listed as an endangered species. Livingstone’s fruit bat or flying fox (Pteropus livingstonii) is a bat found only on two islands in the Comoros group located off the eastern coast of Africa between northern Madagascar and north-eastern Mozambique, whence a number of ‘Johanna men’ accompanied the Zambesi expedition. The rarest and largest of all Comorian bat species, these animals defend themselves by spraying urine at potential predators. Again, this is a threatened species due to destruction of its preferred forest habitat. (Both Meller’s duck and Livingstone’s fruit bat may be seen at the Durrell Wildlife