As they lack the ego and resourcefulness of the rest of their breed, hieracosphinxes can be pressed into service of mounts, particularly by those of similarly evil dispositions. Hieracosphinxes chafe under such service but submit to more powerful riders, though they still inflict their foul tempers on any weaker creatures that happen by. A grown hieracosphinx can easily consume a full horse's worth of meat in a day, making their upkeep rather expensive. Even with these drawbacks, hieracosphinx eggs command values of up to 1,500 gp on the open market, as do young hieracosphinxes. It takes 3 years for a hieracosphinx to reach maturity, after which an untrained hieracosphinx only rarely accepts a rider without magical compulsion. Trainers, though hard to come by, charge thousands of gold pieces to rear and train a hieracosphinx, owing to the risk to life and limb.