The Winged Monkeys are a species of flying primates inhabiting OZ. They were made slaves to the Golden Cap by a vengeful sorceress and must obey the owner of the cap. After melting the Wicked Witch of the West Dorothy became the owner of the cap and returned it to the Monkeys, freeing them from bondage!
At the posted co-ordinates you will find a small cache left by the Monkeys for you to find, it contains a stamp if you've brought your own inkpad, but otherwise just some trinkets for trade.