Cave Swallows breed from southern Texas and New Mexico south to Peru, as well as in the Caribbean. They are blue-gray above with a chestnut-colored rump and forehead. They nest in colonies in caves, sea cliffs, and sinkholes, under bridges and on ledges of buildings.
We saw a flock of Cave Swallows on some wire outside of lagoon we visited in southwest Puerto Rico. They seemed to be relaxing and enjoying the breeze.
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