How do swallows work with "no" and "yes"?

Swallows are either catching pests in the air or trying to build nests and brood.

Swallows spend a lot of time catching pests in the air. It is one of the most flexible birds, mainly feeding on insects such as mosquitoes and flies, and is a well-known beneficial bird.

Swallows nest in tree holes or cracks, or drill holes in sand dikes, or stick mud on walls or protrusions of corridors, roofs, eaves, etc. Looking for nests in cities and rural areas. Most of these nests are made of saliva-bonded soil and grass stalks, covered with soft weeds, feathers, rags and so on. And some Artemisia annua leaves. The bird's nest is dish-shaped. Breeding 2 nests every year, mostly from May to early June and from mid-June to early July. Each nest lays 4 ~ 6 eggs. The second nest is less, 2 ~ 5 pieces. Eggs are milky white. Males and females hatch eggs together. 14- 15 days, chicks hatch and parents eat together.