Quote:DNA testing on the 41,000-year-old bone indicated Denisovans were distinct from our species and Neanderthals.
But not distinct enough to be unable to interbreed.
Quote:In biology, a species (plural: species) is one of the basic units of biological classification and a taxonomic rank. A species is often defined as the largest group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, the difficulty of defining species is known as the species problem.
http://en.wikipedia.org/wiki/Species
We desperately need a specimen of Homo Erectus DNA to examine. This
could be everyone's Great to the nth degree Grand Pappy.