About 66 million years ago – perhaps on a downright unlucky day in May – an asteroid smashed into our planet.
The fallout was immediate and severe. Evidence shows that about 70% of species went extinct in a geological instant, and not just those famous dinosaurs that once stalked the land. Masters of the Mesozoic oceans were also wiped out, from mosasaurs – a group of aquatic reptiles topping the food chain – to exquisitely shelled squid relatives known as ammonites.
