Sometimes, the only way to spot a tiny critter like a small, very rare frog, or an insect the color of leaves, is by listening for its signature ballad to pierce the cacophony of forest sounds. A team ...

Over in the waxy monkey frog exhibit, one frog is very alert and active while its exhibit mates are lazy. Monkey frogs don’t even act very frog-like. With an opposable thumb, monkey frogs climb trees ...