Most experimental cat breeds are crossbreeds. In the CCP, artist Koen Vanmechelen crossbreeds chicken breeds from different countries. In the 18th century they crossbred with Shorthorns; fully grown crossbreeds weighed to . They have owned several Felis bengalensis wildcat crossbreeds. The best yields came from holstein-friesian dairy cattle followed by crossbreeds and criollo. So, breeders have focused on created crossbreeds between foreign horses and native Mongolian stock. These crossbreeds were probably an attempt to create showy driving horses. This is a list of common dog crossbreeds. It is not known if these horses were domestic crossbreeds or imported. Some of these crossbreeds are used for milk production. A herd of cattle-wisent crossbreeds (zubron) is maintained in Poland. Their spread may have been enhanced through the emergence of strong crossbreeds. The chicks they produce will therefore be crossbreeds or "crosses". However, in recent years, the introduction of fast foreign crossbreeds has changed the sport. In many crossbreeds, one animal is larger than the other.