Assuming the binomial distribution, artiodactyls, bandicoots and bilbies, bibymalagasians, proboscideans and xenarthrans have significantly more extinct species than expected, and bats have significantly fewer (table 1).
Significantly more species of artiodactyls, perissodactyls, primates and sirenians are threatened, while bats, opossums and rodents have fewer threatened species than expected.