Watchful by Cheryl Strahl Via Flickr: A sow with her cub will sometimes look like she is smacking her lips when she senses another bear approaching them. Her body language basically conveys her expressions of fear, nervousness and apprehension. She will usually retreat after she demonstrates this behaviour. We witnessed this several times as the bears came and went from the bend in the creek. Funnel Creek, Katmai National Park and Preserve, AK. Seen during the Sockeye Salmon run this past summer.
Source: Flickr / cheryl_strahl