It has an introductory essay on "Species Concepts and Species Limits in Ornithology" by Jürgen Haffer.
From his studies on the Amazonian avifauna, he authored several papers on Neotropical ornithology and devised his Amazonian refugia theory to explain the rapid diversification of the Neotropical fauna in Pleistocene times.
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In 2013, Haffer was commemorated with the newly described Campina Jay, Cyanocorax hafferi.
The genus Selenidera was used by the German biologist Jürgen Haffer as an example of the "refugia" hypothesis of speciation.
Jürgen Habermas | Jürgen Klinsmann | Jürgen Prochnow | Jürgen Möllemann | Jürgen Budday | Jürgen von Beckerath | Jürgen Vogel | Jürgen Schult | Jürgen Rüttgers | Jürgen Chrobog | Jürgen Ahrend | Jürgen Steinmetz | Jürgen Schmidhuber | Hans-Jürgen Syberberg | Hans-Jürgen Papier | Jürgen Trittin | Jürgen Straub | Jürgen Stark | Jürgen Schadeberg | Jürgen Rohwer | Jürgen Osterhammel | Jürgen Haffer | Jürgen Cain Külbel | Jürgen Bartsch | Jürgen Aschoff | Jürgen Alzen | Hans-Jürgen von Arnim | Hans-Jürgen Stumpff | Hans-Jürgen Bäumler | Bernd Jürgen Fischer |