Yes, it was a Cuckoo day. Literally. I heard, and saw both species of Cuckoos today!
First I heard the Black-billed as I was listening to a singing Canada Warbler.
Then, I was sitting on my front porch when I heard that characteristic "knocking" sound coming from the maple tree next to my house! I ran and grabbed my camera and managed to get some shots of this Yellow-billed Cuckoo: