Do gray swallows need nest?

Gray swallows generally do not need nests, and need to be needed when breeding.This kind of bird is generally not manually made, and it has the ability to make a nest.Its nest is usually under the eaves, or in the wall, and it is a mud nest, which is different from that of many grass -roots bark.Its nest is cup -shaped. After the breeding period is done, it will hatch eggs. Until the young bird leaves the nest, the pro -bird will leave the nest.