Summary: Revisiting the subjects of the first three Wild Episodes! Just how common is the huge, ridiculously long-lived Greenland Shark? New research has the beginnings of an answer. The Lord Howe Island Stick Insect can't go home until someone gets rid of the rats. Those rats are still there, but elsewhere there's big, big news in the world of rat eradication from islands ... And finally, it turns out the truth about Scotland's corn crakes is not as cheerful as I suggested in the third episode.
