You are walking on the beach and suddenly you see a bird plummeting out of the sky into the water. What was that?

The Whidbey Audubon Society invites you to register for a four-week class series with Constance Sidles, beginning Tuesday, Jan. 7.

Fish have been a rich source of food for birds for millions of years — certainly long enough for avians to have evolved many styles of fishing. In this series of classes, Sidles will show you the strategies different species of birds use to go fishing. They are by turns ingenious, persistent, patient, aggressive, cooperative and altogether wondrous.

Come to the sea, the rivers, ponds and lakes with Sidles as she talks about the plungers and the pickers; the snatchers and the stalkers; the chasers and the scoopers — including her favorites, the pelicans.

This online course is Tuesday evenings from 7 to 8:30 p.m. on Jan. 7, 14, 21 and 28. The cost is $100. Registration is at www.whidbeyaudubonsociety.org/events-list/go-fish-four-lecture-class-with-connie-sidles. Each session will be recorded, so that those registered may review it.

Sidles is the founder and president of Constancy Press, LLC. Before beginning Constancy Press, Sidles was a production consultant with more than 30 years of experience in print production. She is a master birder with more than 600 North American birds on her life list. She has led several trips for Seattle Audubon Society and currently serves as chair of Seattle Audubon’s Publications Committee.