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.

An echidna looks like a hot spiky ball of yellow, orange and white in this heat-vision video — except for its chilly nose, which shows up as a purple and black blob.

The echidna was dead and “fully intact” with “all its spines and its legs” when it was regurgitated by the three-meter-long (almost 10-foot) shark, according to Lubitz.