There are two proposed species that lived from 1.9 to 1.6 million years ago. Their relation has not been clarified. One of them is called "Homo rudolfensis". It is known from a single incomplete skull from Kenya. Scientists have suggested that this was just another habilis, but this has not been confirmed. The other is currently called "Homo georgicus". It is from Georgia and may be an intermediate form between "H. habilis" and "H. erectus", or a sub-species of "H. erectus".