This is a young Black-Crowned Night Heron. My husband spotted it walking around our local lake and ran back to grab the camera and snap a photo for me. It's rare to see one in our neighborhood; even more rare to see one out and about during the day, since they hunt and forage mostly at night or in the early morning. They sometimes vibrate their bills in shallow waters to lure small fish for their dinners. This guy looks pretty intense.