Horse breed been produced. Such restrictions have led to legal challenges in the United States, sometime based on state law and sometimes based on antitrust laws. Horses can crossbreed with other equine species to produce hybrids. These hybrid types are not breeds, but they resemble breeds in that crosses between certain horse breeds and other equine species produce characteristic offspring. The most common hybrid is the mule, a cross between a "jack" (male donkey) and a mare. A related hybrid, the hinny, is a cross between a stallion and a jenny (female donkey). Most other hybrids involve the zebra (see Zebroid). With
Multi-male group more than one adult male, more than one adult female, and offspring. Within Order Primates, it is the most common social group type, with group sizes ranging from 10 to 100 individuals composed of several males, and numerous females and offspring. Large groups of primates are called "troops”, which are characterized by complex intratroop politics and competition. Multi-male groups are most common among semi-terrestrial primates such as savanna baboons and macaques, but is also seen in some colobus and New World monkeys. Social lemurs sometimes often live in multi-male groups, and other primate species like chimpanzees live in fission-fusion multi-male