Moreover, as with any taxonomic group, species-specific factors, such as evolutionary history and sensory abilities, need to be taken into account in order to interpret findings on cognition, emotion, sociality, and other characteristics and to make better informed comparisons across taxa.Therefore, what follows is a brief description of evolution, phylogeny, and domestication, as well as sensory systems, in chickens.).
In other studies, their welfare is ultimately related to productivity.
Far less numerous are studies of chickens on their own terms—as birds, within an evolutionary and comparative framework.
Rather, the answer may lie with the context in which we usually encounter them and how their use interacts with perceptions of their intelligence.
Unlike many other birds, chickens are categorized as a commodity, devoid of authenticity as a real animal with an evolutionary history and phylogenetic context.
When asked to rate the typicality of chickens as a member of the more general category of birds, raters usually give chickens a low score indicating that they are not considered typical birds (Malt and Smith ).