1. The Honey-buzzard will dig a huge hole, sometimes almost burying itself, as it excavates a wasps' nest. 2. An ancient stone circle on The Machars in Dumfries & Galloway is known as the Wren's Egg. 3. Runaway slaves were known as 'blackbirds'. 4. The Fieldfare may deliberately defecate on would-be nest-predators; its flight calls recall human chuckling. 5. Adult male Smews are known as White Nuns; an anagram of SMEW gives MEWS, or 'cat-calls'. 6. Probably just under 1 million Puffins breed in Britain & Ireland, the largest colony being on St Kilda; the World population is probably around 12 million. 7. The RSPB symbol, of course. 8. A Wren's egg weighs 4 g, an Ostrich's egg 1,600 g. 9. Just southwest of the summit of Ben Lomond lies the 2,398-foot subsidiary peak called The Ptarmigan. 10. The castles or rooks in chess start in each corner of the board but then can be moved only directly ahead or to the left or the right at right angles, never diagonally. 11. The old name 'shriek-owl' reflects the Stone-curlew's weird nocturnal cries.The three postcards drawn from those giving the correct answer were sent by R. A. Frost (Derbyshire), P. G. Lansdown (Cardiff) and Steve Lister (Leicestershire), each of whom wins a bottle of The Famous Grouse Scotch whisky.