National Geographic has just published an amazing series of photographs that chronicle the hidden lives of rare birds. This kakapo blends so perfectly with its environment that it's easy to see why they are so hard to find.

Kakapo photograph by Shane McInnes

You can see NatGeo's full series of images on their site.

Thanks, Marilyn Terrell!

Red crowned crane by Huajin Sun

Brazilian merganser by Savio Freire Bruno

Christmas Island frigatebird by David Boyle

Great Indian bustard by Csaba Barkoczi