Imagine a world where females are fifty times larger than males, who die immediately after mating. Or where females have to protect their offspring from being eaten by their own father. Or where males parasitically fuse with their female mates, ultimately becoming indistinguishable from their mate and host. These worlds exist… right here, just not for humans. Daphne Fairbairn teaches biology at the University of California, Riverside. She’s the author of “Odd Couples: Extraordinary Differences Between the Sexes in the Animal Kingdom” and she joined Brian Standing on August 26.