A look at the constant need to feed necessitated by the demands of flight in species from sap suckers and crows, to robins and geese.

A look at the way birds communicate. The program shows us how calls of warning can unite a community of birds against a larger predator and how other calls may be used to attract mates.

A look at how birds deal with hostile environments and with people. The episode ranges from crows in Japan that use traffic to crack nuts to penguins who never see a person but make long treks through frigid wastes.