It has been several years since I have seen one of the rarer grebes on Thornton, so it was very pleasing to find a Summer plumaged Red-Necked Grebe at about 9.30 this morning. The grebe was frequenting the central area of the reservoir, with a small group of Great Crested Grebes. It was still present at about 1800 when it was closer to Stoney bank, the eastern side of the reservoir. This bird has probably wintered off our coast and is now heading back east towards Central Europe. Earlier this morning a short ringing session produced a male and female Blackcap and one Chiffchaff. The Chiffchaff was a returning bird that I had previously rung last July. It is very satisfying when birds return to a site, an indication that it fits their requirements. The hirundine numbers increased again today and there were one or two more House Martins. The White Wagtail was again in the field off Stoney Bank and a Treecreeper was seen carrying nesting material.