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  1. water boatman

    • n.
      a predatory aquatic bug that swims on its back using its long back legs as oars. It is able to capture large prey such as tadpoles and fish.;an aquatic bug which spends much of its time on the bottom, using its front legs to sieve food from the water and its hair-fringed rear legs for swimming.
    • noun: water boatman, plural noun: water boatmen