The American bald eagle is a highly specialized predator. But what is the evolutionary background that allows the bald eagle to pull off its amazing maneuvers?

In 1963, there were fewer than 500 bald eagle breeding pairs in the lower 48 states. Click around these interactive maps to find out how many pairs there were from 1990 to 2000.

When the mother bald eagle feeds her two eaglets, the older one gets much more to eat. The younger sibling may not survive for long.

Production credits for Birds of the Gods.

A Blue bird of paradise displays for local conservationist Miriam Supuma.

Learn about this threatened bird, endemic to southern Iraq's marshlands.

Discover where the various kinds of penguins live on the Antarctic ice.

Mother penguins reunite with their mates and chicks -- and celebrate survival in the harsh Antarctic climate.

Male king penguins strut their stuff in a penguin version of the Paso Doble, courting prospective mates.

(Airs Sunday, August 1) Brave the extreme conditions of Earth's southernmost continent for a close-up look at the varied penguins of the Antarctic.