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
The Female of the Species (poem) "Female of the Species". The title was again lifted in 2006 for Joanna Murray-Smith's satirical play "The Female of the Species". A 1946 novel by James Hadley Chase was titled "More Deadly Than The Male". Another novel, written by Mindy McGinnis, is titled “The Female of the Species.” In 1984, Off Centaur Publications released an audio tape cassette album titled "The Horse-Tamer's Daughter" featuring a song based on the poem, set to music by Leslie Fish and performed by Julia Ecklar. In 1998, the song was nominated for a Pegasus Award for "Best Adaptation" by a ballot of science fiction