CNN The Wonder List With Bill Weir March 14, 2015 01:37:00
Deep in these swampy mangrove jungle gyms on isabella. how can you tell it's abandoned from here? >> the binoculars. >> okay. i thought you had some kind of bird sense. >> oh, did you hear that in tut, tut, tut? >> that's a good sign. they stay completely hidden during our hike, but here's some footage captured by francesca's team. not only are these birds threatened by rats, but sometime in the late 1950s, a random cargo brought a certain kind of fly to the galapagos, a fly that feeds on the beaks of baby finches. >> it's like a horror story. the adult fly lays its eggs in the nest, and the f...