A chara, – Ciarán D'Arcy recommends the Chirpomatic mobile phone app to "naturists with even a passing interest in the world of winged creatures" ("App set to help birdwatchers identify species based on song"). It is to be hoped that it will also be available to those of us who prefer to keep our clothes on when watching birds. – Yours, etc, LORCAIN CAMERON Carr's Hill, Douglas, Cork.