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05_Chimney_Swift_Salivary_Arch

Mated pairs of Chimney Swifts must produce saliva to glue together the twigs that they collect to form their nests. Only the mated pairs are capable of producing this glue-like saliva. While incubating the eggs, this saliva is still produced even though the nest construction is complete. The excess saliva is often deposited on the wall in an arch above the nest by the incubating adults...

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