@Thylo- They want "Saddle-Billed Stork."
I'm in a similar situation to zooboy28, with 44/50, and one being on the tip of my tongue but not remembering it.
The stats were interesting too - the hardest bird to get was the Capuchinbird, and the easiest was the Yellow-eyed Penguin.
Hix
I think the reason "yellow-eyed penguin" is so easy is because penguins are so recognisable, and the quiz only requires "penguin" as an answer (or "stork", etc.), not the full common species name.