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<a href='http://ireport.cnn.com/docs/DOC-1130449'>Jim Heston </a>takes nightly swims at a pool near Cambodia's Mekong River but he's rarely swimming alone. During the hot and dry months of March to May, the insects and bats know to head to the pool. Heston says he doesn't mind the company. "Swimmers will do their laps while the bats feed," he said.

Jim Heston takes nightly swims at a pool near Cambodia's Mekong River but he's rarely swimming alone. During the hot and dry months of March to May, the insects and bats know to head to the pool. Heston says he doesn't mind the company. "Swimmers will do their laps while the bats feed," he said.