. >> just look how one of those b-list animals can leave lucy cooke star struck. >> you guys have gotr way through the costa rican rain forest, cooke noticed this, what looked like fluffy golf balls, she realized was a cluster of something we've never heard of. >> come have a look. >> the elusive caribbean white tent-making bats. >> look. they're bats, but they're white and they live in these leaves. >> my heart rate's gone right up and i'm going to start pouring in sweat, and i might start crying because it's just a miracle of evolution, and it's just, like, why? just why? >> that sense of wonder, that's about as exciting as it gets, has made lucy cooke a compelling advocate for sloths. >> like them, she looks at the world from a different point of view. your latest book is called -- >> "bitch." >> i do apologize you and your work, but yeah, my book's called "bitch." >> it cooke argues the narrative that males are usually dominant and promiscuous while females are sub missive and monogamous. she traveled the world to collaborate with scientists and studied dozens of animals reporting