Behavior: They are timid, often scattering when active, but can be kept in groups. They are highly terrestrial but known to climb. Terrarium Temperature (°F): They can tolerate a temperature range of 65 to 80 degrees, but prefer temperatures in the low to mid 70s. Temperatures over 85° are dangerous. Measure temps with a digital thermometer. Humidity: Like most poison dart frogs, leucs prefer a humidity range of 70–100%, but can tolerate humidity down to 50% for short periods of time if the frogs have access to water. Low humidity levels, especially without access to water, can quickly be fatal.