National Geographic celebrates Earth Month with some flightless, feathered friends in "Secrets of the Penguins," streaming Monday on Disney+ and Hulu.

From diving off cliffs to starving for months, emperor penguins are continuing to surprise scientists with their ability to adapt to one of the world’s most extreme environments.

In 2019, Andréa Thiebault and her team members quietly slipped into Marion ... the Macaroni penguin feeds mostly on schooling ...

The researchers sequenced the genomes of the 20 living penguin ... wings into flippers. They also reduced the air spaces in the skeleton and increased bone wall thickness to increase diving ...

"If you follow a penguin just for a day ... So let's get off our butts and do something." Take a dive into uncharted waters when "Secrets of the Penguins" premieres tonight at 8/7c on National ...