The Bird Men, always superlative at espionage, can have the ability to train their ambassadors to monitor and report on changes to diplomatic relations. This additional training may cause other races to reject your ambassadors.
This advantage is disabled by default, and can be researched with Campaign Resources. No special Mission or Friendly Code is required to trigger this advantage.
This advantage is worth 20 advantage points and is only available to The Empire of the Birds.
The research cost for this advantage is: