Sand Martin Vs House Martin
house martin (delichon urbicum) - red-rumped swallow ,house martin (delichon urbicum) similar to sand martin but noticeably dryer, more rolling and less raucous. typically varies the pitch of the call more. song a .house martin (delichon urbicum) - barn swallow (delichon ,house martin (delichon urbicum) similar to sand martin but noticeably dryer, more rolling and less raucous. typically varies the pitch of the call more. song a .house martin (delichon urbicum) - magpie (delichon ,house martin (delichon urbicum) similar to sand martin but noticeably dryer, more rolling and less raucous. typically varies the pitch of the call more. song a .bto - british trust for ornithology,watch the bto bird id workshop to help resolve any confusion with sand martins and swallows. nests made of mud. house martins are semi-colonial, with some .