2 weeks
Swallows and the law. Swallows and their nests are fully protected under the Migratory Bird Treaty Act of 1918, which makes it illegal to intentionally kill, injure or take any migratory bird. It is illegal to intentionally damage or destroy the nest, eggs, or young of a swallow while it is being built or in use.  1 Tree Swallow: Nest building can take 2-4 weeks, and is done only by the female, and usually only during the morning. 2  There may be quite a gap for egg laying, but it is usually done synchronously with neighbors – i.e., neighbors lay within 7-10 days of each other (sometimes just 1-2 days apart.). It depends on a variety of factors: 1  weather and day length, which stimulates hormones etc. 2  brood number: e.g., bluebirds may complete the nest for a second brood much more quickly. 3  food availability. 4  competition: e.g., if a bird has to spend days fighting off others of its same species or competitors, this can delay nest building. 5  experience: I ... 1 If food is scarce, it takes time away from nest building. 2  E.g., Tree Swallows may abandon nests for days at a time and fly 20 miles away looking for food. 3  competition: e.g., if a bird has to spend days fighting off others of its same species or competitors, this can delay nest building. It depends on a variety of factors: 1  weather and day length, which stimulates hormones etc. 2  brood number: e.g., bluebirds may complete the nest for a second brood much more quickly. 3  food availability. 4  competition: e.g., if a bird has to spend days fighting off others of its same species or competitors, this can delay nest building. 5  experience: I ... Top. 1  Nests contain and confine eggs and young in one place. 2  Nest structure clusters eggs and young together for efficient incubation and brooding. 3  Nests can protect and insulate eggs and young from wind, cold, and damp that could conduct heat away. 4  Tree Swallow arrival, site claiming, and pair formation take place while it's still cold. 5  Early .... 1 Nest structure clusters eggs and young together for efficient incubation and brooding. 2  Nests can protect and insulate eggs and young from wind, cold, and damp that could conduct heat away. 3 1 food availability. 2  Birds seem to sense or are programmed to know when there is enough for babies that need to be fed every 15-30 minutes. 3  If food is scarce, it takes time away from nest building. 4  E.g., Tree Swallows may abandon nests for days at a time and fly 20 miles away looking for food. It depends on a variety of factors: 1  weather and day length, which stimulates hormones etc. 2  brood number: e.g., bluebirds may complete the nest for a second brood much more quickly. 3  food availability. 4  competition: e.g., if a bird has to spend days fighting off others of its same species or competitors, this can delay nest building. 5  experience: I ... Even in species where the male does not incubate the eggs the male may sit on them when the female is away to reduce heat loss. Incubation stints last for 5–15 minutes and are followed by bursts of feeding activity. From laying, swallow eggs take between 10–21 days to hatch, with 14–18 days being more typical. The chicks of swallows hatch naked, generally with only a few tufts of down. The eyes are closed and do not fully open for up to 10 days.  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. Barn 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. Why did it take so long to start laying eggs, and why did they start laying now? * Tree Swallow eggs are small, about 1.9 gm, but female swallows are small birds, averaging only 20 gm. Each egg weighs about one-tenth the weight of the bird laying it, and females lay between four and seven eggs, one per day. 1 Egg laying can be delayed (sometimes for a week or two - 3 weeks is not unheard of) in cold weather, for young parents, or in cases where food is scarce. 2  Tree Swallow: Nest building can take 2-4 weeks, and is done only by the female, and usually only during the morning. It depends on a variety of factors: 1  weather and day length, which stimulates hormones etc. 2  brood number: e.g., bluebirds may complete the nest for a second brood much more quickly. 3  food availability. 4  competition: e.g., if a bird has to spend days fighting off others of its same species or competitors, this can delay nest building. 5  experience: I ... Reproduction Time from start of nest building to departure of young is 44 to 58 days. Nest building is done by both sexes and begins around April. Both parents take turns incubating three to five eggs, which hatch after 12 to 17 days. Figure 1. The barn swallow (Hirundo rustica) is a distinctive bird with bold plumage and a long, slender, deeply forked tail. It has blue-black upper parts, a reddish throat and breast, and a rust or buff colored belly. Females are slightly duller and shorter-tailed than males.
http://www.abolishpestcontrol.com/swallownests.htm http://www.sialis.org/howlong.htm http://www.sialis.org/howlong.htm http://www.treeswallowprojects.com/cnestbld.html http://www.sialis.org/howlong.htm https://en.wikipedia.org/wiki/Swallow http://flybye.com/swallow.html https://answers.yahoo.com/question/index?qid=20080512093406AAJGBmJ http://www.sialis.org/howlong.htm http://wdfw.wa.gov/living/swallows.html
how long does it take for a swallow to build a nest