Search and rescue volunteers in B.C.’s Sea to Sky region are urging hikers to be mindful that “aggressive” wasps are out in force—and asking people to help track where nests are found. Lions Bay Search and Rescue posted a statement online Tuesday, warning that the stinging insects are “fierce this year” as a result of weather patterns. “A relatively mild winter followed by an early, warm spring allowed more queen yellowjackets to survive hibernation and establish new colonies,” the post from Lions Bay SAR said. “With a longer growing season, those colonies have had more time to expand, resulting in larger, more defensive nests by late summer.” Reporting active nests encountered on trails is encouraged, either by contacting Lions Bay SAR directly or by adding to a crowd-sourced map at wasp-watch.com. Wasps in this region of the province nest on the ground, posing a particular hazard for hikers. “Their nests are often hidden beneath roots, rocks, logs, or vegetation beside the trail. You may not see the nest until you accidentally step near it, triggering dozens of wasps to defend their colony,” Lions Bay SAR said. “Unlike bees, yellowjackets can sting repeatedly.” Hikers are advised to carry non-drowsy antihistamines, cortisone cream and over-the-counter painkillers like acetaminophen or ibuprofen. Anyone who has been prescribed an EpiPen should always have it on hand. People hiking with dogs should also be aware that the animals may sniff out or disturb a nest, putting them at risk of stings around their snouts.