gibbon egg. Bedford's paper also stated that human spermatozoa would not even attach to the zona surface of non-hominoid primates (baboon, rhesus monkey, and squirrel monkey), concluding that although the specificity of human spermatozoa is not confined to man alone, it probably is restricted to the Hominoidea.In 1977, researcher J. Michael Bedford discovered that human sperm could penetrate the protective outer membranes of a
"In 2006, research suggested that after the last common ancester between humans and apes converged into two distinct lineages, inter-lineage sex was still sufficiently common that it produced fertile hybrids for around 1.2 million years after the initial split. However, despite speculation, no case of a human-chimpanzee cross has ever been confirmed to exist."
OK, so there aren't any human-chimp hybrids around, but that can't stop me from posting more images of what they could look like if the mating had been successful. Here are three such images: