Sexual dimorphism — physical differences between the sexes of the same species — is a widespread and fascinating, yet mysterious, natural phenomenon. It even captivated Charles Darwin and inspired him ...

Forbes contributors publish independent expert analyses and insights. GrrlScientist writes about evolution, ecology, behavior and health. Spectacular plumage color like that seen in many parrot ...

Female birds often sport less colorful plumage than males of the same species. Some birds evolved this sexual dichromatism as an adaptation related to mating and survival, but scientists still don’t ...

Analysis: many of the birds who dress to impress a potential mate also have longer lifespans and higher adult survival rates There are two types of animal species on our planet; those where males and ...

A new species of freshwater fish in the family Characidae, called Hyphessobrycon myrmex, seized the attention of researchers at the University of São Paulo's Zoology Museum (MZ-USP) in Brazil because ...

DICHROMATISM, or the change of colour of an absorbing medium with increasing thickness, is usually shown with plates of coloured glass. It is not always easy to obtain the right kind of glass, and ...

Today’s featured amphibian is the yellow toad, a creature whose method of reproduction is often studied. They are explosive breeders that exhibit dynamic sexual dichromatism. What does that mean?

- a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) ...