You probably don't want to mess with this mama bear.
Launched in 2012, the National Park Service-run camera features a group of bears that prowl for salmon at Brooks Falls within the reserve. While there are several cameras posted throughout the Brooks Camp area that's home to at least 100 bears, the feed from the falls may be one of the most exciting to watch as the larger males compete for fish.
Born during the winter months, brown bear cubs leave the den around June but continue to be under the constant supervision of their mother until they mature, according to the Alaska Department of Fish and Game. Once a brown bear gives birth to a litter she watches over her offspring for the next two to four years and tends not to mate until her cubs are fully grown.
Watch the mother bear defend her litter in the clip above, or see what's happening at Brooks Falls on the live bear cam on Explore.org.