Learn about the tracks and footprints at White Sands National Park in New Mexico, possibly representing the earliest evidence of human-made transportation technology.

Together, the trackers and collars weigh about a half ounce. They collect and store data until the animal is recaptured and the device removed, unless the animal slips out of it. Because of the ...

Practically every square inch of ground has been covered within a week's time with various wild animal tracks in this yard in ...