For a great portion of history most people didn’t travel far from home, so whatever they knew about the rest of the earth was hearsay. As a result descriptions of beasts and monsters in remote parts of the globe became prevalent in writings and maps. Some creatures, like the Blemmae, seemingly moved across the globe when their original places of origin became more explored and uncovered. Blemmaes were first believed to live in Northern Africa, then were cited as living on Asian Spice Islands where Le Relationi Universali places them, and after that were believed to reside in South America. This belief in strange creatures in less explored parts of the world is still prevalent today with creatures like Bigfoot or the Loch Ness monster.
[Sciopod African Monster]
[Central Asian Monster]
Nicholas Kahn and Richard Selesnick
Rider of the Apocalypse
[Blemmae Asian Monster]
Soem observations made in travelling through France, Italy, &c