Constantin Wilhelm Lambert Gloger
Constantin Wilhelm Lambert Gloger (1803 near Grottkau, Silesia, Kingdom of Prussia–1863 in Berlin) was a German zoologist and ornithologist.
Gloger was the first person to recognise the structural differences between swallows and swifts, and also the first to put up artificial bat boxes.
He was the originator of Gloger's rule, which states that dark pigments increase in races of animals living in warm and humid habitats. He put forward this theory in his Das Abändern der Vögel durch Einfluss des Klima's (1833). His other works include Gemeinnütziges Hand-und Hilfsbuch der Naturgeschichte (1841).