大象传媒

Often mistaken for swallows, the house martin is a familiar sight around our towns and villages where it builds gravity defying nests under house roofs. Its near cousin the sand martin is Europe's smallest hirundine (as martins and swallows are called). Unlike the house martin, sand martins build their nests in burrows deep within sandy cliff faces along rivers or the coast as we'll hear in this extended version of Tweet of the Day featuring Bill Oddie, Steve Backshall and audio-visual artist Kathy Hinde.

Producer : Andrew Dawes