Melanie Woods/HuffPost Canada A western hemlock looper moth is pictured in Burnaby, B.C. Every year during the butterfly migration I explain to people that they’d all be scared too if these were moths. They’re western hemlock loopers, and pose little threat to people. Western hemlock loopers experience a surge in population — ironically called an “outbreak” — roughly every 11 to 15 years on B.C.’s coast, and every 20 years in the interior. Western hemlock loopers mostly feed on trees, particularly hemlock and Douglas fir trees.

Source: Huffington Post September 10, 2020 19:30 UTC