A coal tit: Periparus ater.

Coal tits are small passerines, very similar in appearance to their close relatives, great tits, bluetits and marsh tits, also resident in the reserve. Coal tits have a distinctive white patch on the nape of their neck and a longer bill than most other Paridae.

A pair has been seen near the main entrance. Hopefully they are raising a nestful of chicks in a hole in one of the big oak trees at that end of the reserve.