Mosquito populations are high in this area. The use of insect repellent is strongly!!! recommended. However, dragonfly populations are also high. It is a thing of beauty to watch the feast that ensues when a pack of dragonflies descends on the mosquitoes annoying you at your campsite. Additionally the only way out other than boating is by puddle jumper i.e. small airplane which is typically only used in emergency situations. Standard radio frequencies are monitored by park rangers and several other base locations, so it is recommended to carry a radio transmitter. The area is inhabited by bears. They are unlikely to bother you if you stick to the campsites and trails, but a "bear-bag" should be used when you camp as a precaution - having your food stolen in the BWCA is not a good thing!