A prized game bird, the Salvin's curassow (pictured above in an April 2008 camera-trap photo in northeastern Peru) is declining throughout the human-inhabited areas of its range, which also includes Colombia and eastern Ecuador.

But the turkey-size bird seems to be doing well in areas without hunting pressures, such as in the secluded region of the Amazon where this photograph was taken.

For the Peruvian Amazon Biodiversity Project, National Zoo researchers are using a new type of digital "trail" camera with sensors that register an animal's body heat and movement. The new digital cameras also store thousands of photos, so the scientists don't need to trek off-site to develop film.