Bears will clack their fangs as a show of defense when they are surprised or startled. This is also a very good sign that you are way too close.
Grizzlies will fight for mating rights or to establish their dominance
To see bears in the wild, look for signs of them like overturned rocks and stumps, torn-up rotten logs, scratch marks and bits of fur on tree bark, scat, and tracks in snow or mud. Keep your distance during bear encounters and stay calm. Keep noise minimal but talk calmly as a way to alert …
Male polar bears are about 10 feet/ 3 meters tall when standing on their hind legs
While walking on all fours they can be around 5ft/ 1.6m tall. Polar bears are the largest of the bear species.