The trio take off on a mission to aid the flying fox when Greybeard accidentally parachutes into a neighbor's yard.

Jane, David, and Greybeard try to sniff out why the gharial has a bulbed snout. A day at the pool points Jane toward an answer.

The three friends travel deep into the ocean to figure out why the blue whale sings, and Jane confronts a litterbug with a gifted voice.