it causes huge mortality. and other ones, you know, they fledge a lot lighter and smaller than they ought to be. >> that is a horror story. >> in the papaya use to attract them. >> so she lives out here trying to save birds she can barely see from flies she can barely catch. what do you say to someone who things, well, there are 13 other kinds of finches in the galapagos and maybe there's others we haven't discovered and this saul pais all part of the cycle, some survive and some don't. why is it worth all your time and money to save this one little bird? >> because it's sort of humanity's problem that's up to us to solve. >> we broke it, we should fix it. >> yeah. >> heading off the first man-made mass extinction seems like a thankless task.