Species of the day: House Martin | Sussex Wildlife Trust
The House Martin Survey | BTO - British Trust for Ornithology
House martin building nest under eaves of house in Northern Greece Stock Photo - Alamy
Northern/Siberian House-Martin - eBird
House Martin | BTO - British Trust for Ornithology
House Martin | Littlehampton Museum
House martins in dire decline because 'homeowners are destroying their nests' | Daily Mail Online
House Martins/swallows - No Birds Here!
Prevent Housemartins Nesting in Your Eaves | No More Birds
House martins: July bird of the month - The English Garden
Nest cups – House Martin Conservation UK & Ireland
Almost Wordless Wednesday: House Martins | The Anxious Gardener
House Martin Box success | Three Amigos Birding
House Martin Nest (Double) | CJ Wildlife
House Martin breeding
House martin - Norfolk Wildlife Trust
House Martin on Arran - Arran Birding
Swallows and House Martins Desperately Need Our Help - Valencia Birding - Guided Bird Watching in Spain
Five facts you need to know about house martins - Scottish Nature Notes - Our work - The RSPB Community
Cooperative defence of colonial breeding house martins (Delichon urbicum) against nest-usurping house sparrows (Passer domesticus)
House Martin - BirdWatch Ireland
Did you know a house martin's nest is made with 1,000 beak-sized pellets of mud? | Scottish Wildlife Trust
A Circlage of House Martins — Photograph France
File:House Martin nests (35255196250).jpg - Wikimedia Commons
