The state of grizzly bear populations in Banff is seen as a proxy for ecological integrity. To keep bears away from humans, an electric fence was put up around the summer gondola and parking lot at Lake Louise in 2001. Bear-proof garbage cans, which do not allow bears to access their contents, help to deter them from human sites. The fruit of Buffaloberry bushes is eaten by bears, so the bushes have been removed in some areas where the risk of a bear–human encounter is high.