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
Female and Male Herm (sculpture set) the eastern side of the path and "Male Herm" on the western. They have remained in approximately the same place since (with the exception of some time in storage during the 1992 Formal Garden renovation). The marble sculptures are monitored, cleaned, and treated regularly by the IMA art conservation staff. Both sculptures are considered structurally sound and stable as of 2011. Female and Male Herm (sculpture set) Female Herm and Male Herm are a set of two neoclassical marble herms in the outdoor sculpture collection of the historic Oldfields estate, located on the campus of the Indianapolis Museum of Art