Not quite extinct, but really hard to find

Using DNA, scientists have discovered that one of the species of Galapagos tortoises once thought extinct probably isn't. 

'Extinct' Galapagos Tortoise Reappears 

'Extinct' for 150 years, an iconic Galápagos giant tortoise species lives

Well, now the next step is to do a 100% complete census of the entire tortoise population, to see if the putative survivors really do exist on the island. That will be one heck of an effort. I hear Earthwatch calling. Still, this is one of those rare opportunities to rediscover a supposedly extinct species -- and possibly save them from extinction. Maybe, just maybe.