Fossil mammal had a sting in the tooth

时间:2019-03-03 08:11:02166网络整理admin

By Kurt Kleiner TELLTALE grooves in the fangs of a 60-million-year-old fossilised mammal suggest that it injected venom to paralyse its prey. It is the only extinct mammal known to have delivered poison. Bisonalveus browni was a 10 to 15-centimetre-long predator with pointed teeth. But its bite had something extra – two long upper canines with grooves that seemingly allowed it to deliver poisonous saliva into the flesh of its prey (Nature, vol 435, p 1091). According to Richard Fox and Craig Scott of the University of Alberta in Edmonton, Canada,