THE PILOT REPORTED THAT WHILE CHECKING CATTLE HE OBSERVED TWO COYOTES AND MANEUVERED TO GET A BETTER LOOK. WHILE OBSERVING THE ANIMALS OUT THE RIGHT SIDE OF THE AIRCRAFT, AND WITH THE AIRCRAFT IN A GLIDE OVER DESCENDING TERRAIN, THE WHEELS TOUCHED THE SNOW AND THE AIRCRAFT NOSED OVER. A LOW OVERCAST CEILING AND SNOW COVERED TERRAIN RESULTED IN POOR CONTRAST OF THE SURROUNDING TERRAIN.