John Endler

John Arthur Endler FRS (born 1947) is a Canadian 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.

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.

In 2008 the European Research Council announced that he was among the first cohort of Life Scientists to receive an award under its Advanced Grants scheme.

[4] In 2021, he and Susanne von Caemmerer were jointly awarded the inaugural Suzanne Cory Medal for Biomedical Sciences.

[5] Endler's work on evolution in trinidadian guppies was highlighted in the 1995 popular science book The Beak of the Finch.