@Surasanji @alex horses and donkeys are of different species but most times they can have an offspring and in rare cases it is even fertile as well. Homo sapiens do show proof of cross breeding with neanderthal to the degree of about 3% shared genome. One might argue that we are genetically close enough to chimps and Bonobos for potemtially viable interbreeding, but I am pretty sure current taboos prevent the science from even trying such experimentation.