Asian Treeshrew SkullsTreeshrews are small mammals native to the tropical forests of South East Asia that, as counter intuitive as it seems, are not shrews and do not necessarily live in trees. Incredibly enough, they have a higher brain to body mass ratio than any other mammal on Earth (though small animals generally have a high ratio). They are omnivores eating insects, fruits, and seeds. These skulls are roughly 1. 75" long and cannot be shipped outside of Canada.