You can use an Explorer unit to set up an Expedition to study the bones. In the E3 demo, an expedition resulted in; "After many fruitless months excavating the Alien Skeleton, an alien lifeform approached from the wilds as if it was called. Your Expedition team quickly armed itself, but this proved unnecessary. Whatever reverence it held for the dead skeleton seems to have transferred to you. An alien Wolf Beetle is now under your control!"