Two singles and two pairs of Black Guillemots were showing interest in nesting holes in the sea wall at the east end of Greenock Esplanade this lunchtime. A Feral Pigeon also seemed to be nesting there and a pair of Mute Swans have built a nest (and laid an egg) on the tiny triangle of beach left by the tide. Two Greenfinches were singing and two Oystercatchers were resting on the breakwater.