Asian Treeshrew Skulls
Treeshrews 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.