Russell Freedman, Animal architects, New York, Holiday House, 1971, pp. 59- 61.
Archives du mot-clé shield
The design of the case
Will Barker, Familiar Insects of America, New York, Harper & Brothers, 1960, p. 222.
Can they learn by experience?
Lorus Johnson Milne & Margery J. Milne, A Multitude of Living Things, New York, Dood, Mead & Company, (1945) 1947, pp. 35-43.
Homo Sapiens
Horatio Gordon Hutchinson, A fellowship of anglers Longmans, Londres, Green & Co., 1925, p. 92-95.
The process is repeated
Rosalie Lulham, An Introduction to Zoology with Directions for Practical Work, MacMilan & Co, Londres, 1913, pp. 322-323.
The Boy-Scout
Percival W. Westell, Nature stalking for boys. Throught Field-Glass, Stereoscope and Camera, Londres, J.M. Dent, 1909.
From Ceylon
Robert MacLachlan, « On caddis-worms and caddis-flies », West Kent Natural Hist. Microscopical and Photogra. Soc., 1882, p. 41-45.
Billy! Billy!
Maria Charlotte Lees , Summer hours, Ill. de l’auteur, Londres, Darton & Co.,1859, p. 24-27.