Today, people cross Arabians with other breeds to add refinement, endurance, agility and beauty. In the US, Half-Arabians have their own registry within the Arabian Horse Association, which includes a special section for Anglo-Arabians (Arabian-Thoroughbred crosses). Some crosses originally registered only as Half-Arabians became popular enough to have their own breed registry, including the National Show Horse (an Arabian-Saddlebred cross), the Quarab (Arabian-Quarter Horse), the Pintabian the Welara (Arabian-Welsh Pony), and the Morab (Arabian-Morgan). In addition, some Arabians and Half Arabians have been approved for breeding by some Warmblood registries, particularly the Trakehner registry.