The starry night frog and other rediscovered species

Rediscovery of a species missing for decades. This is one of those cases where scientists could have rediscovered it much earlier, but they neglected to ask the locals in Columbia about it., or asked the wrong one.

Here's an article from a couple of years ago listing five more rediscoveries. While the Javan elephant  may not count (that case is about identifying the ancestry of a known population), it's a good reminder that hope can be abandoned too quickly when a species goes missing.