Francis Galton was a British scientist and explorer.
Narrative of an explorer in tropical South Africa, ch. IXEdit
As the Bushmen learnt to understand our Hottentot a little better, we had some long talks about the animals on the river that joins the western end of the lake; that there are many there quite new to the Hottentots is beyond doubt, as several carosses were stolen by the Kubabees and brought back south, and the skins that many of these were made from were quite unknown to them. The Bushmen, without any leading question or previous talk upon the subject, mentioned the unicorn. I cross-questioned them thoroughly, but they persisted in describing a one-horned animal, something like a gemsbok in shape and size, whose horn was in the middle of its forehead and pointed forwards. The spoor of the animal was, they said, like that of a zebra. The horn was in shape like a gemsbok's, but shorter. They spoke of the animal as though they knew of it, but were not at all familiar with it. It will indeed be strange if, after all, the creature has a real existence. There are recent travellers in the north of tropical Africa who have heard of it there, and believe in it, and there is surely plenty of room to find something new in the vast belt of terra incognita that lies in this continent.