This is a duck I saw on the lake at Great Salt Plains State Park in Oklahoma, getting ready to dive underwater. I'm not completely sure on the species; it kind of looks like a merganser, but if any birders out there can help me identify it for sure it would be appreciated! Anyway, there were two of them floating around the lake's surface diving down to look for food on the lakebed. They actually spent more time below water than above - they disappeared for around 10 seconds at a time, then only surfaced for a second or two before they dove back under again. It was really neat to watch them!