Rabbits!
The latest article on JK Revell's ( @JKRevell) Synapsida blog is a deep dive into the biogeography and palaeontology of rabbits, where they come from, and how they've spread to just about everywhere around the world.
"the rabbit is truly native only to Spain, Portugal, and southern France, with the Romans having introduced the pre-domesticated form across the rest of Europe"
"In contrast, the cottontail rabbits of North America proved behaviourally unsuited to domestication, although the ancient Mexicans gave it a try"
http://synapsida.blogspot.com/2026/01/rabbits-in-ice-ages.html