Quercus warned today that the colony of common swifts in the walls of Trancoso Castle, in the Guarda district, "probably the largest in Portugal," is in danger due to ongoing works on that structure. The environmental association cited the example of the Guimarães City Council, which interrupted the cleaning work on the walls during the nesting season. "Every year, the common swifts return from Africa in mid-April to nest."
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Quercus warned today that the colony of common swifts in the walls of Trancoso Castle, in the Guarda district, "probably the largest in Portugal," is in danger due to ongoing works on that structure. The environmental association cited the example of the Guimarães City Council, which interrupted the cleaning work on the walls during the nesting season. "Every year, the common swifts return from Africa in mid-April to nest."