NPR's Mary Louise Kelly talks with Regina Barber and Aaron Scott of Short Wave about building cellular 'robots,' the bizarre sleeping habits of chinstrap penguins, and a lost echidna found again.

For some penguins, it means thousands of mini-catnaps a day, researchers discovered. Chinstrap penguins in Antarctica need to guard their eggs and chicks around-the-clock in crowded, noisy colonies.

Most parents of little ones function with a sleep deficit — but some penguins have figured out a way to catch more Zzzs. Nesting chinstrap penguins take more than 10,000 mini naps per day ...

Chinstrap penguins (pictured, animals at the Newport Aquarium in Kentucky) usually lay two eggs at a time. Sleep-deprived human parents know the value of a quick nap, but it turns out chinstrap ...

For some penguins, it means thousands of mini-catnaps a day, researchers discovered.Chinstrap penguins in Antarctica need to guard their eggs and chicks around the clock in crowded, noisy colonies.