With their charming waddles, heat-conserving huddles and tuxedo-like plumage, emperor penguins are among the world's most recognizable animals. Recent satellite surveys estimate that hundreds of thousands of the flightless birds live in 66 colonies spread around Antarctica's inaccessible, frozen coa stlines. But those numbers could fall in the coming decades because emperor penguins rely on landfast (or fast) ice—a type of sea ice attached to the shoreline—to breed, raise chicks and molt. ...read more read less