A Mystery

An American bittern stands in the water next to Rest Lake at Ridgefield National Wildlife Refuge in Ridgefield, Washington

This is one of my favorite bittern pictures as it shows the way I often wind down a day at Ridgefield, watching bitterns near the end of the auto tour before I have to leave to beat the closing of the automated gate, the setting sun leaving the bittern to hunt in shadow. These last moments always make me wonder — what do bitterns do in the dark?