Search for hero dog that tracked four children in the Amazon 

Belgian shepherd Wilson went missing during the search and is now himself the target of a sophisticated rescue operation

Wilson and four more sniffer dogs were taken to the rainforest in May to find the single engine Cessna plane that had crashed into the rainforest, carrying the four children and three adults who were later found dead. picture: Colombia's Armed Forces Press Office via AP

A search is under way for a dog which became a national hero in Colombia after he helped the military find four indigenous children who survived a plane crash and were lost in the Amazon jungle for 40 days.

Pawprints from the military-trained search dog, called Wilson, led trackers to the children earlier this month.