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13 cm. Iridescent blue back and crown, brown wings and tail, rufous forehead, white rump, white underparts, shallowly forked tail. The sexes are similar, but young birds are duller and browner, with a paler forehead and pale fringes to the back and wing feathers.
Previously included in genus Hirundo.
Petrochelidon nigricans has 3 subspecies
Nests are made in natural holes in dead trees or rock crevices from grass and leaves, but may be reinforced with mud. A mud and plant fibre cement is also used to reduce the width of the entrance to the breeding hole. 3-5 brown and mauve-spotted white eggs are laid; they may be double-brooded.
References: Lepage D. 2008. Avibase. Search for "Tree Martin" downloaded 31 January 2008.
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