This Killdeer - Charadrius vociferus - was totally nonplussed by my presence and allowed me within three meters while foraging for shoreline food.
The distribution range noted in Sibley implies that Killdeer should not be in Calgary during the colder months but I occasionally see these shorebirds during the winter. eBird confirms sightings from December to February.
Sibley DA. The Sibley Guide to Birds. Alfred A. Knopf. New York. 2000.