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The humanzee (sometimes chuman, manpanzee or chumanzee) is a hypothetical hybrid of chimpanzee and human, thus a form of human–animal hybrid.Serious attempts to create such a hybrid were made by Soviet biologist Ilya Ivanovich Ivanov in the 1920s, [1] and possibly by researchers in China in the 1960s, though neither succeeded.
Extant primates exhibit a broad range of variation in sexual size dimorphism (SSD), or sexual divergence in body size. [4] It ranges from species such as gibbons and strepsirrhines (including Madagascar's lemurs) in which males and females have almost the same body sizes to species such as chimpanzees and bonobos in which males' body sizes are larger than females' body sizes.
Continuous breeders are animal species that can breed or mate throughout the year. This includes humans and apes (bonobos, chimpanzees, gorillas, orangutans, and gibbons), who can have a child at any time of year. In continuous breeders, females are sexually receptive during estrus, at which time ovarian follicles are maturing and ovulation can
Gorillas, which have a polygynous mating system, have smaller testes than other primates. Humans , which have a socially monogamous mating system , have moderately sized testes. [ citation needed ] The moderate amounts of sexual non-monogamy in humans may result in a low to moderate amount of sperm competition.
A chimpanzee's testicles are unusually large for its body size, with a combined weight of about 4 oz (110 g) compared to a gorilla's 1 oz (28 g) or a human's 1.5 ounces (43 g). This relatively great size is generally attributed to sperm competition due to the polygynandrous nature of chimpanzee mating behaviour.
In this mating system, the adult males mate exclusively with the adult female. [1] [2] Polygyny, or a polygynous mating system, is when one adult male mates with two or more adult females. [1] [2] It is the most common type of mating system in observed in primate studies. [1]
Chimpanzees have full mouth-to-mouth contact, and bonobos kiss with their mouth open and mutual tongue stimulation. [2] There are a variety of acts to show affection such as African elephants intertwining their trunks, giraffes engaging in "necking", and Hanuman langurs cuddling with each other in a front to back sitting position.
Koolakamba, legendary chimpanzee-gorilla hybrids; Bili ape, real-life ape with characteristics intermediate between chimpanzees and gorillas; Mangani, fictional ape with similar characteristics as the Bili ape from Tarzan; Hobo, a fictional chimpanzee-bonobo hybrid in the novel Wake; Humanzee, theoretical chimpanzee-human hybrid