Story highlights Margaret River Pro canceled because of shark threat Two nearby attacks prompted call Sharks behaving aggressively because of beached whales CNN — Thundering waves and shallow reefs are an occupational hazard for surfers, but a professional contest in Margaret River, Western Australia, has been canceled because of aggressive sharks. Message from WSL CEO Sophie Goldschmidt here: https://t.co/pR1iKJhPMM pic.twitter.com/zskvtOL0WE …