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BoolQ / do barn swallows lay eggs more than once a year

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do barn swallows lay eggs more than once a year
passage · full text (1,094 characters)
There are normally two broods, with the original nest being reused for the second brood and being repaired and reused in subsequent years. The female lays two to seven, but typically four or five, reddish-spotted white eggs. The clutch size is influenced by latitude, with clutch sizes of northern populations being higher on average than southern populations. The eggs are 20 mm × 14 mm (0.79 in × 0.55 in) in size, and weigh 1.9 g (0.067 oz), of which 5% is shell. In Europe, the female does almost all the incubation, but in North America the male may incubate up to 25% of the time. The incubation period is normally 14--19 days, with another 18--23 days before the altricial chicks fledge. The fledged young stay with, and are fed by, the parents for about a week after leaving the nest. Occasionally, first-year birds from the first brood will assist in feeding the second brood. Compared to those from early broods, juvenile barn swallows from late broods have been found to migrate at a younger age, fuel less efficiently during migration and have lower return rates the following year.

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task_id
d65a474c-e825-5fdb-ba21-4fca6997755c
task_key
default--validation--d65a474c-e825-5fdb-ba21-4fca6997755c
task_revision_id
1
config / split
default / validation

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