White wagtails preying on mayflies.

In the Ope River in the town of Moroyama, white wagtails and Japanese wagtails were preying on mayflies that had eclosed on the surface of the water. Mayflies are preyed upon immediately after they eclose on the surface. Some mayflies escape into the forest without being preyed upon. Some of the mayflies do not eclose properly and are unable to fly. I observed them from April 15 to around April 25.

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