some National Parks in America, subject to guidelines and closed areas. In the 21st century, special forces have received guidance on the use of horses, mules, llamas, camels, dogs, and elephants as pack animals. Load carrying capacity The maximum load for a camel is roughly 300 kg. Yaks are loaded differently according to region. In Sichuan, is carried for 30 km in 6 hours. In Qinghai, at 4100 m altitude, packs of up to are routinely carried, while up to is carried by the heaviest steers for short periods. Llamas can carry roughly a quarter of their body weight, so an adult male of can carry some . Loads for equids are disputed. The US Army specifies a maximum of 20 percent of body weight for mules walking up to 20 miles a day in mountains, giving a load of up to about . However an 1867 text mentioned a load of up to . In India, the prevention of cruelty rules (1965) limit mules to and ponies to . Reindeer can carry up to 40 kg for a prolonged period in mountains. See also Pack station References External links Llama Backpacking Documentary produced by Oregon Public Broadcasting Domesticated animals Animal-powered transport Military animals