Jungle Telegraph Meaning

(idiomatic) A gossip network; an informal communication system within a group or organization.

Example: 1958, "Live Virus in the Jungle," Times, 11 Aug.:
  Working both sides of the stream, they got native chieftains to pass the word by jungle telegraph.
2008, Lisa Marsh "‘Hills’ Under Tents," New York Post, 5 Feb. (retrieved 19 Sep. 2008):
  And the jungle telegraph at Bryant Park is alive with rumors that the show's biggest name, Lauren Conrad, will be here any day.