Darwinian puzzle 3207752 64001193 2006-07-15T19:50:32Z Cydebot 1215485 Robot - Moving category Animal behaviour to Ethology per [[WP:CFD|CFD]] at [[Wikipedia:Categories for deletion/Log/2006 July 1]]. A '''Darwinian puzzle''' is a [[Trait (biological)|trait]] that appears to reduce the [[fitness (biology)|fitness]] of individuals that possess it. Such traits attract the attention of [[evolutionary biology|evolutionary biologists]]. The phrase "Darwinian puzzle" itself is rare and of unclear origin; it appears most often, but not always, in the context of [[animal behavior]]. ==Examples== The following phenomena are sometimes called Darwinian puzzles: *[[Altruism in animals]] *[[Homosexuality in animals]] *[[Senescence|Cellular senescence]] {{evolution-stub}} [[Category:Ethology]] [[Category:Evolutionary biology]]