Zebroid Zebroid A zebroid is the offspring of any cross between a zebra and any other equine: essentially, a zebra hybrid. In most cases, the sire is a zebra stallion. Offspring of a donkey sire and zebra dam, called a zebra hinny, or donkra, and offspring of a male horse and a female zebra called a hebra do exist, but are rare and are usually sterile and infertile. Zebroids have been bred since the 19th century. Charles Darwin noted several zebra hybrids in his works. Zebroid is the term generally used for all zebra hybrids. The different hybrids are generally named
Extended female sexuality males. According to Hrdy's hypothesis, extended female sexuality is an adaptive process with an aim of creating paternity confusion in their male counterparts. Paternity confusion refers to the male being unsure as to whether offspring are genetically his own. If the female mates with different males (at all points of her ovarian cycle) whilst concealing fertility, then the males will inevitably have paternity confusion. Paternity confusion is proposed to be an adaptive function for preventing infanticide. Thus, if the female can successfully create paternity confusion, males will be less likely to kill her offspring, as the lack of paternity certainty