By Richard Bowdler Sharpe - A monograph of the Hirundinidae, Public Domain, https://commons.wikimedia.org/w/index.php?curid=18876929
Swael
Sources:
(*) https://en.wikipedia.org/wiki/Blue_swallow
(*) https://ebird.org/species/bluswa1
(*) https://search.macaulaylibrary.org/catalog?taxonCode=bluswa1