Tree Shrews (also Treeshrews), native to Southeast Asia, are not
true shrews but are more related to primates. For this
reason they have sometimes been used in medical research in
place of rodents or primates. They have a higher brain to
body mass ratio than any other mammal (including humans).
Most are diurnal and eat insects and fruit. The Northern
Tree Shrew, shown, is native to much of Southeast Asia