What is the species that helped Brian think about the fish in the lake in Chapter 11?

The species of bird that made Brian think of fish was the kingfisher.

Sitting on one limb was a blue bird with a crest and sharp beak, a kingfisher—he thought of a picture he had seen once—which left the branch while he watched and dove into the water. It emerged a split part of a second later. In its mouth was a small fish, wiggling silver in the sun. It took the fish to a limb, juggled it twice, and swallowed it whole. Fish. Of course, he thought. There were fish in the lake and they were food. And if a bird could do it...