Nuthatches. How smart are they?

Had a quick go at finding the recent Lesser Spotted Woodpecker at Adel Dam YWT the other day. A bit ambitious with the kids and not a lot of time. Several smart Mandarin were in front of Marsh Hide, plus a rather corking Great Spotted Woodpecker and a couple of Nuthatches. I have not really looked hard at a Nuthatch for ages, despite seeing them fairly often. What a superb little bird. Different to all other UK species and full of perky, energetic character. A real treat. Sadly the Lesserpecker never showed up.