On the usual dog walk at Cossie this morning, first thing was a posing Wren, albeit in dense shade but managed to retrieve a passable shot. Then 9 Gadwall on W lake was a good count. Then – wow! – scanning through the loafing Black-headed Gulls on W lake by the centre viewpoint, a smaller individual with a black, shorter bill …. Bonaparte’s Gull! A first in the park for me. Quickly got a Tweet and a Whatsapp out then got some photos. Fortunately it wasn’t right out in the middle of the lake. Also of note, a Chiffchaff singing by the conservation area gate, and a Cetti’s Warbler singing in E lake reeds.