Rare Jurassic fossil find reveals secrets of mammalian evolution 🦴🐿️ Researchers have compared two fossilised skeletons of an extinct mouse-sized creature called Krusatodon kirtlingtonensis, which lived on the Isle of Skye in Scotland around 166 million years ago. The fossils were unearthed decades apart: the first in the 1970s, and the second in 2016. Together, they are a rare find – two fossils from the same species, one an adult, one a juvenile. The research team could compare the specimens