Love — or at least sex — was in the air of the small, windowless, biosecure room at the Fort Worth Zoo in Texas. Sixteen rectangular, clear plastic bins lined the room’s back and side walls, tiny ...

Amphibians like frogs and toads are a great way to observe metamorphosis. They lay eggs that develop into tadpoles, and then these tadpoles develop into froglets and toadlets until at last we have our ...