Coots are easy prey this time of year, and Bald Eagles know it.
Driving through Crex Meadows Wildlife Area a couple of years ago, just after freeze-up, I discovered a patch of open water on Phantom Lake. Swimming in a pool about 40 by 10 feet were maybe two dozen coots. Coots need to run across the water to gain air speed for takeoff. The pool was short. There were nine Bald Eagles loafing on the ice nearby. I watched one rise and fly to the far end of the pool, then glide its length. The coots knew trouble when they saw it. The roly-poly dark birds jammed against the ice when they ran out of water. The force of the jam popped one of the coots out of the water onto the ice. It was helpless there, not that it mattered for long.The eagle knew exactly what it was doing — herding coots into the lunchroom. The big raptor, feet dangling, swept the luckless coot away, landing far enough from the other eagles to eat undisturbed.
A couple of days ago a South Dakota birder, on that state’s birding email list, described another eagle strategy. This bird found four coots, flew low over them, hovered, forcing a dive. It repeated its hovering until the coots were exhausted. It was no problem then to pluck a coot from the water.
The coot below was found at Rice Lake National Wildllife Refuge, north of here on Highway 65. It was running for that elusive air speed. I took the photo from a very loud, very fast air boat used to tour Rice Lake and count the Ring-necked ducks that gather there by the 10s of thousands in fall migration.
BTW -- Bald Eagles can be found right now on many lakes that are partially ice-clad. On two Lake Minnetonka bays yesterday I saw seven eagles. They sit at ice edge and wait for unwary waterfowl, mostly ducks now, coots having moved on south.