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
Travels with a Donkey in the Cévennes us the landscape that makes us who we are." Several writers, such as the Scottish novelist Christopher Rush, have written of their own efforts to retrace Stevenson's steps. Accounts include a bicycle trip 25 years after Stevenson's hike and a comic adventure on the part of two British women. A section of Richard Holmes' "Footsteps: Adventures of a Romantic Biographer" chronicles the author's retracing of Stevenson's journey as well. Travels with a Donkey in the Cévennes Travels with a Donkey in the Cévennes (1879) is one of Robert Louis Stevenson's earliest published works and is considered a pioneering classic of