Something took a bite out of one of the biggest predators in Cambrian seas, an extraordinary fossil shows – and it could well be cannibalism https://www.newscientist.com/article/2586883-healed-fang-wound-found-on-520-million-year-old-apex-predator/?utm_term=Autofeed&utm_campaign=echobox&utm_medium=social&utm_source=Twitter#Echobox=1788683551