"He fixed webcams to four elephants. One carried a "trunk-cam" - a device resembling a huge log concealing a camera which could be held in its trunk and dangled close to the ground.The BBC, which is producing this 3-part series (narrated by, who else, Sir David Attenborough) has the story.
Another had a "tusk-cam" hooked over its tusk. The elephants moved so steadily that the images are pin-sharp. Other log-cams were left on the forest floor.
The high-definition cameras were created by inventor Geoff Bell for a documentary in the remote Pench National Park in Madhya Pradesh in the heart of India."
Producer/director John Downer has more information (and video) on his production company's website. (via MeFi)
Speaking of photo hacks, India's Ullas Karanth used the "camera-trap" technique to great success. I found a terrific blog dedicated to "camera-traps" and it has a very good profile of Mr. Karanth. Browse through the blog for examples of camera-trap photography.
Link to Pench National Park (why oh why can't Indian national parks have their own websites?)
Link to Pench's Tiger Reserve website.