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
Male/Female (Borofsky) versions of the sculpture exist in Kagoshima, Japan ( tall) and Bielefeld, Germany ( tall). Male/Female (Borofsky) "Male/Female" is a tall hollow stainless steel sculpture by Jonathan Borofsky standing at the entrance to Pennsylvania Station in Baltimore, Maryland. It depicts intersecting colossal male and female forms with pulsing light-emitting diode light. Male Female is a work of public art commissioned by the Municipal Art Society of Baltimore City, a private non-profit organization founded in 1899 "to provide sculptural and pictoral decoration and ornaments for the public buildings, streets and open spaces in the City of Baltimore, and to help generally