I thought the crow had dropped it, but describing it to elimlothwhen he got back from cycing, he said it was probably an Asian walking fish that was heading for the shallows; as an intrusive alien maybe throwing it back into the lake was a good thing. It could be a walking catfish (I think it looked like a catfish or more like a forest catfish) like the ones in Florida that spike your tires if you drive over them, or a snakefish which can grow to the size of a golfbag; in either case I'd be lucky I didn't get spiked and I wonder if someone needs to know it's in Lake Washington!
Maybe the heron I saw under the bridge will catch it!
Cue a nice ride into Seatlle with neraly all the downtown exits closed for resurfacing (thanks Rene!), checking in to a huge room at the W and a lovely dinner at (ahem) Shucksters: clam chowder and Steelhead (a it like salmon, a bit like trout) with goat cheese mashed potatoes and Horse Heaven Sauvignon Blanc. And now, I think, bed ;-)