Northern Lapwing

The northern lapwing is a broad-winged plover, 28–33cm long with a 67–87cm wingspan. Its plumage looks black and white at a distance, but the back has a green iridescent sheen. Adults carry a narrow swept-back crest; breeding males show a longer crest and stronger black on the crown, throat and breast, while females and young birds are less sharply marked. Its tumbling display and ringing pee-wit call are conspicuous over breeding ground. (Wikipedia, northern lapwing account)

Northern lapwings breed on farmland and other open ground with short vegetation, placing three or four eggs in a shallow scrape. Adults vigorously defend both nest and chicks. Most populations are migratory and may gather in large daytime-moving flocks; outside breeding they frequent open fields and mudflats. They mainly eat insects and other small invertebrates, sometimes trembling one foot against the ground to bring worms upward, and may feed at night under moonlight. (Wikipedia, northern lapwing account)