how long does it take for a swallow to build a nest
Both male and female swallows help build the nest. They have to take their time, allowing the mud to dry and harden. Depending on the climate, nest construction could take up to 2 weeks. A typical cliff swallow's nest contains about 900 - 1400 mud pellets. Swallows lay their eggs during early spring.arn swallows usually nest as a single pair or a few pairs in one structure. The cliff swallow, 5 to 6 inches in length, is the only squared-tailed swallow in most of North America.. It has a pale, orange-brown rump, white forehead, dark, rust colored throat, and steel-blue crown and back.