INDEX 



Imitation of other species' songs and call-notes, see list; Marsh 



Warbler, xxi, 56, 57. 

 , powers of, Sedge Warbler, xxiii, 11. 



of song, list of species, Blackcap, iv, 31, 33. 



of Whitethroat's song by male Blackcap, i, 16. 



Imitations, congenital, Blackcap, iv, 32. 

 Imitative faculty, xxi, 55. 



■ , Blackcap, iv, 33, 44. 



• powers of Blackcap, iv, 12, 17, 18, 22, 30, 31, 32. 



- — ■ , able to repeat any sound found in bird life, Marsh Warbler, 



xxi, 60, 61. 



, Lesser Whitethroat, ii, 6, 16. 



-, Marsh Warbler, xxi, 56, 61, 65. 



, Reed Warbler, xx, 58, 59, 60. 



, Sedge Warbler, xxiii, 11. 



■ , Whitethroat, "1, 28. 



■ strains, sequence of, Blackcap, iv, 31. 



Immature Blackcaps, first to arrive, iv, 6. 

 Impulse, internal, Marsh Warbler, xxi, 43. 

 Incorporation of other birds' songs, Blackcap, iv, 34. 

 Incubation, male sings during, Blackcap, iv, 21. 



period, Chiff-chaff, xii, 19. 



•, — — of, Grasshopper Warbler, xxv, 19. 



, Marsh Warbler, xxi, 49. 



, of, Reed Warbler, xx, 46. 



, performed by both sexes, Blackcap, iv, 20. 



-, shared by both parents, Garden Warbler, v, 16. 



, shared by both sexes, Marsh Warbler, xxi, 49; Reed Warbler, xx, 



46. 



■ , skulking habits during, Grasshopper Warbler, xxv, 8. 



, song ceases during, Grasshopper Warbler, xxv, 10. 



, time of, Whitethroat, i, 17. 



, Willow Warbler, xiv, 25. 



, Wood Warbler, xv, 16. 



Injury, feigning, Lesser Whitethroat, ii, 8; Partridge, ii, 8; Reed 



Bunting, ii, 8; Wild Duck, ii, 8; Avocet, ii, 9; Kentish Plover, ii, 10; 



Reeve, ii, 10; Teal, ii, 10. 

 Inquisitiveness, Chiff-chaff, xii, 25, 27, 28. 



-, Willow Warbler, xiv, 27. 



Instinct, evolution of, Whitethroat, i, 20. 



feeling, Marsh Warbler, xxi, 11. 



of nest building, Marsh Warbler, xxi, 65, 66. 



of pugnacity, Marsh Warbler, xxi, 65. 



of reproduction, Marsh Warbler, xxi, 65. 



, plasticity of, Chiff-chaff, xii, 26. 



Instinctive activities, Whitethroat, i, 17. 



routine of activity, Wood Warbler, xv, 6. 



Intelligence, as shown by antics, &c, xxi, 15. 

 Intelligent modification, Blackcap, iv, 21. 

 Interbreeding, prevention of, Reed Warbler, xx, 20, 21. 



15 



