Do birds have kneecaps?

I've spent a lot of time in the Zoology museum this month, both front of house (helping people find things in the museum, including the only baculum) and behind the scenes. (Yes, they have let me get my hands on the skeletons!) Specifically, the bird skeletons that are off to go for teaching resources needed to be unpacked, photographed and given a thorough condition report. (If you haven't done museum condition reporting, but have hired a car from a very dodgy company, you'll know that feeling when they walk around inspecting every possible angle and noting tiny dents, dings, scratches and cracks. And then, miraculously when you return the car having only taken it down the road, filled it w