Book 25, Question 80
How do common nighthawks nest on city rooftops?
Common nighthawks are birds that catch flying insects at dusk.
They used to nest on bare ground in open areas, and flat gravel roofs are similar. A mother lays her camouflaged eggs right on the gravel with no nest. You may hear the booming sound of males diving through the air in summer evenings. Nighthawks are listed as a species at risk in Canada.