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
Female cosmetic coalitions will be whether Male B gains sufficient fitness via a roving strategy of picking up cycling, non-cosmetic females. If Male A is not able to compete with Male B in terms of dominance, he is better off choosing the cosmetic females. Because Female B and her non-cosmetic female neighbors get the attentions, but no reliable investment, from Male B, they discourage any investment from the likes of Male A. Once costs of encephalization begin to bite and cooperative strategies are needed to support offspring, how many females will be choosing philanderers in preference to investors? Those females are not likely