For many male birds, colors are an advantage, but for their female counterparts, it's typically the opposite. Females typically bear the responsibility of incubating eggs, and they must keep watch ...

For the study, nine male-female pairs of Eurasian jays (a member of the Corvid family) from two colonies were tested during the breeding season – the only time when jays share food.

Eurasian Jay (Garrulus glandarius). Credit: Luc Viatour/Wikipedia Knowing what another person wants is not a trivial issue, particularly when the other's desires are different from our own.