The Plan to Save the Rhino With a Cervix-Navigating Robot

The duck is famous for two things: really liking bread (even though they're not supposed to be eating it), and wielding insanely complicated reproductive bits. More specifically, male ducks have corkscrew-shaped penises, while females' reproductive tracts corkscrew in the opposite direction. But you know who tends to get short shrift for their own bizarrely complicated reproductive system? That would be the rhino. "It's composed of a number of interlocking ridges or rings that makes it look like a number of S's connected to each other for 8 to 12 inches," says Barbara Durrant, director of reproductive sciences at the San Diego Zoo.