Scottish biologist, mostly known for his writings on cryptozoology and the paranormal.
Sanderson published three classics of nature writing: Animal Treasure, a report of an expedition to the jungles of then-British West Africa; Caribbean Treasure, an account of an expedition to Trinidad, Haiti, and Surinam, begun in late 1936 and ending in late 1938; and Living Treasure, an account of an expedition to Jamaica, British Honduras (now Belize) and the Yucatan.
I don't think there's been a better book on the topic released since. Yes, science has progressed in some ways, but much of it in a way that Sanderson predicted. One of the most amazing books by one of the preeminent zoologists of the mid-twentieth century.
Pocket-gophers, Hare-lipped and hollow-faced bats, Jerboas, Capybaras, Narwhal, Lynxes, Mongooses, Okapi... damn, there's a lot of living mammals of this world...