Dino-era rat claimed as earliest mammal ancestor of humans
UK-based scientists have discovered 145 million-year-old fossilised teeth of rat-like creatures, claimed to be the earliest fossils of mammals belonging to the lineage that led to blue whales and human beings. The fossils of the small, furry, nocturnal creatures were uncovered at UK's 'Jurassic Coast' in Dorset, named a World Heritage Site due to its richness in dinosaur fossils.