Abstract
No Abstract.
References
Turner, A. & C.A. Rose (1989): Handbook to the Swallows and Martins of the World. Christopher Helm, London. Pp. 201–204.
Holden, P. (2016): RSPB Birds: their Hidden World. Bloomsbury Publishing, England. <https://www.bloomsbury.com/uk/rspb-birds-their-hidden-world-9781472932242/>
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