Otters Diego and Icana have never mated; can new male Tarubu light Icana's fire? Andean bears Lima and Madidi aren't getting on. And two butterflies get drunk on fermented fruit.

Jaguars Napo and Goshi haven't been breeding. Will training Napo to be more assertive change that? Young elephants Aayu and Nandita are seriously ill. Plus: silvery gibbons and dragon-headed katydids.