you know it's ironic. i saw so much wildlife roaming free but to catch the one creature that threatens most of them, i had to visit a glass case. this is the rogue's gallery of rats. as careful custodians or the government of ecuador, the charles darwin foundation keeps a catalog of life both native and invasive. these are the different beaks? >> we have a woodpecker finch. >> this is a record of change from darwin's favorite finches to the snake that's developed a taste fof seafood. >> these guys have adopted to eating fish. >> i heard about this. >> so they find it hard to find little critters on land and they go into the water. but the fate of tp galapagos an other wild corners of this planet ultimately depend on how