What is a unique feature of the tracks of grizzlies?

The unique feature of the tracks of grizzly bears is that they show visible long, slightly curved claws. This characteristic is a distinct identifier when examining bear tracks. Grizzlies, unlike other bear species, tend to have longer claws which can leave noticeable marks in the substrate where they walk. This feature assists in distinguishing their tracks from those of black bears, whose claws are generally shorter and less pronounced.

The visibility of claw marks can be particularly useful for wildlife enthusiasts and hunters to correctly identify grizzly bear tracks in the field, providing valuable information about the bear's presence and movements. The other options do not correctly capture the distinctive aspects of grizzly tracks compared to those of other bear species. For instance, while deep impressions can occur due to the bear's weight, it is not a unique feature; claw marks being invisible would be more indicative of certain circumstances rather than a characteristic of grizzlies themselves. Similarly, short and wide pad prints do not represent the actual characteristics of grizzly tracks, as their tracks are generally larger and more elongated.