The Rufous Hummingbird measures only 4-inches, but it can pack a lot of beauty into that small package. Often described as "feisty," it weighs just a little more than a penny. With a migratory range of 1500 km, the Rufous has the longest known avian migration proportional to its size.
Mark "Dr. Bugs" Moffett is a Harvard educated entomologist, author and ecologist. He's also one hell of a nature photographer, mainly studying Frogs and Ants (slideshow with audio). Galleries from Frank Pictures, The Smithsonian, and a slideshow and recent interview from NPR's Fresh Air.
Want to take better nature photographs? BBC Wildlife Magazine has published a stack of their 'masterclass' features online. [more inside]
E.J. Peiker, Nature Photgrapher There are a lot of nature photographers out there -- some better than Peiker and some worse -- but what fascinates me about Peiker's site is the number of photos available. A birdwatcher's dream, it features pages of photos of over 500 different species of birds, including an index devoted solely to wild waterfowl. Maybe animals are more your speed? How about nearly 150 pages of photos of wild animals (including my favorite - a quite handsome, flower-eating porcupine.) There's also a section for scenic photography featuring 23 states and 20 countries (or you can search by national park.) The photos are, unfortunately, not that big but there a ton of them, many of them quite pretty.