Bank Swallow - eBird ebird.org

Bank Swallow - eBird ebird.org

Bank Swallow - eBird ebird.org

Bank Swallow (Riparia... www.inaturalist.org

Sand martin - Wikipedia en.wikipedia.org

Sand Martin - Riparia... observation.org

Bank Swallow - eBird ebird.org

Bank Swallow (Riparia... www.inaturalist.org

Bank Swallow - Riparia... birdsoftheworld.org

Bank Swallow (Riparia... www.inaturalist.org

Riparia riparia -... species.wikimedia.org

Bank Swallow - eBird ebird.org

Sand Martin (Riparia... www.birdid.no

Riparia - Wikipedia en.wikipedia.org

Sand Martin, Riparia... luontoportti.com

Sand Martin (Riparia... www.featherbase.info

Maryland Biodiversity... www.marylandbiodiversity.co...

Bank Swallow - Riparia... nhpbs.org

Sand Martin (Riparia... russia.birds.watch

Collared Sand Martin... www.arthurgrosset.com