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
Social groups in male and female prisons in the United States Southwest. She found that officers consistently expressed a preference to work in men's prisons, citing differences between male and female inmates as the main cause; officers perceive female inmates to be more difficult to manage, more likely to question an instruction, and less respectful than males. Many respondents also characterized female inmates as more emotional and therefore more likely to become inexplicably violent, while male violence is rationalized as having understandable goals. In this way, female violence is seen as irrational and ineffective whereas male violence is seen as meaningful and understandable. Britton notes that these perceptions seemed to be