Stripe-tailed Hummingbird was a total brainbird for me when it landed on a feeder a few feet away....I knew this bird was new and different, but had no clue what it was off the top of my head. Stripe-taileds were most easily seen at El Toucanet (where this was photographed), a nice lodge at mid-elevation in the Talamancas.
It is one thing to see a new species of bird. It is another to see something you haven't even heard of before. BB&B's Birder In Residence, The Great Ornithologist Felonious Jive, discusses this new addition to the birding lexicon over at 10,000 Birds. Take a look! And if you haven't been by lately, 10,000 Birds (unbeknownst to me) got a completely new makeover while I was in Costa Rica...it looks pretty slick.