Parental investment
Videos
Parental investment, in evolutionary biology and evolutionary psychology, is any parental expenditure that benefits offspring. Parental investment may be performed by both males and females, females a
A female calliope hummingbird (Selasphorus calliope) feeding her chicks
A human mother feeding her child
A cellar spider (Pholcidae) defending spiderlings
King penguin (Aptenodytes patagonicus) and a chick
Life history theory
Videos
Life history theory is an analytical framework designed to study the diversity of life history strategies used by different organisms throughout the world, as well as the causes and results of the var
Newborn chicks starting their lives