•Animals die during hibernation (difficulty in
conditioning).
•Natural reproduction is unsuccessful (hormonal
induction).
•Poor survival or growth to maturity (squamous
metaplasia & odema).
A costly program is implemented involving two federal hatcheries and 12 zoos to produce
about 8000 tadpoles a year (same as three clutches).
Research needed to improve fecundity
(hormones) and survival (better husbandry).