A curious observation by a British ornithologist during World War I:

The Zeppelin raids … were nearly always heralded in this country by the crowing of pheasants, and the sensitiveness of this species to distant sounds was frequently a subject of comment. There seems no reason to suppose that pheasants have keener powers of hearing than men; it appears more probable that these birds are alarmed by the sudden quivering of the trees, on which they happen to be perched, at the time of an explosion … During the first Zeppelin raid in January 1915, pheasants … thirty-five to forty miles from the area over which the Zeppelins flew, shrieked themselves hoarse. In one of the early battles in the North Sea … Gamekeepers on the east coast used to say that they always knew when enemy raids had commenced, ‘for the pheasants call us day and night’.

On the Western Front, a starling learned to imitate the whistle that warned of enemy aeroplanes. One artillery officer wrote, “It was great fun to see everyone diving for cover, and I was nearly deceived myself one day.” A gun commander wrote of an owl, “The beastly bird learnt to imitate the alarm whistle to a nicety; on several occasions he turned me out in pyjamas and, when the crew had manned the gun, gave vent to a decided chuckle.” See Onlookers.

(Joy Damousi, Deborah Tout-Smith, and Bart Ziino, eds., Museums, History and the Intimate Experience of the Great War, 2020.)