Whatever that is, it’s scary

After 9,000 years of thriving in the absence of mammalian predators, tammar wallabies still startle at some signs of dangerous mammals, according to an Australian study.

No mammal has threatened the wallabies Macropus eugenii on the unsettled part of Kangaroo Island since the island separated from the Australian mainland. The scientists presented caged wallabies with sights and sounds that might signal unfamiliar but dangerous predators.