Hatching a plan • The St. Louis Zoo hopes to release newly hatched Ozark hellbenders — the first to be bred in captivity — into Missouri rivers and replenish the endangered large salamander sometimes known as a “snot otter.” The zoo has been working with the Missouri Department of Conservation for 10 years to try to breed the Ozark hellbender, one of two subspecies of the hellbender that is native to southern Missouri and northern Arkansas.