Swallows like to reuse their nests year after year and make them out of mud pellets.
The process of building a nest requires a lot of energy, and swallows can make over 1,000 journeys. Unoccupied nests are taken over by new pairs.
Most songbirds only utilize a nest for one clutch or breeding season before building a new one, assuming they live to reproduce again. However, one study found that 44% of pairs of swallows returned to the same colony and used the same nest.
The material used to construct the nests is the main distinction between the two nests. Grass, sticks, and other materials are employed in the case of weaver birds. A swallow's nest is constructed of moist mud as well.
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