John Endler

John A. Endler (born 1947) is an ethologist and evolutionary biologist noted for his work on the adaptation of vertebrates to their unique perceptual environments, and the ways in which animal sensory capacities and colour patterns co-evolve.

Born in Canada, Endler took his PhD degree at the University of Edinburgh in Scotland and subsequently worked at the University of California, Santa Barbara and the James Cook University of North Queensland, Australia and is currently working at Deakin University in Victoria, Australia. In 2006 he was appointed as an Anniversary Professor of Animal Behaviour in the School of Psychology at the University of Exeter, England. In 2007 he was elected as a Fellow of the American Academy of Arts and Sciences. In 2009 he joined the Centre for Integrative Biology at Deakin University (Australia) where he is an Alfred Deakin Professor. In 2012 he was elected as a Fellow of the Australian Academy of Sciences.

Endler has carried out extensive work on guppies, including in 1975 rediscovering the species now known to aquarists as Endler's guppy, in his honour; this brightly coloured fish is sometimes regarded as a geographical variant of the common guppy Poecilia reticulata, but is now usually treated as a separate species, Poecilia wingei. Although it had been recorded before Endler's discovery, it had not been properly studied and documented. Among biologists, however, he is better known for his experimental work on inducing small-scale evolution in the laboratory. In addition to his work on guppies he has studied many other species, including investigating the bower-building behaviour of bowerbirds in North Queensland, Australia.

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