Where to look for further information
Bibby et al. (2000) give an excellent and detailed review of techniques, while Bibby et al. (1998) discuss methods with particular reference to bird expeditions. Gregory et al. (2004c) cover survey design and general census techniques; Bennun & Howell (2002) present methods suitable for African forest birds; and Javed & Kaul (2002) do the same for Asian birds. Verner (1985) and Dawson (1985) review census methods, Koskimies & V¨ais¨anen (1991) describe those used in Finland, while the proceedings of the Asilomar Symposium (Ralph & Scott 1981) and of the European Bird Census Council conferences (Czech Stastn´y & Bejcek 1990, Hagemeijer & Verstrael 1994, Helbig & Flade 1999, Anselin 2004) contain many individual research papers on census and survey techniques. Gilbert et al. (1998) and Steinkamp et al. (2003) outline a variety of species-specific methods, Greenwood and Robinson (Chapters 2 and 3 in this volume) introduce much underlying theory, while Buckland et al. (2001) describe advanced methods for density estimation. Finally, Underhill and Gibbons (2002) outline the uses of bird-census information.