Fodder finder...same thing. They both alert people to a person's presence. Let me explain with the example below:

Guy walks into open field. Gets shot in head. Now the other people know where the sniper is because they saw the big flash from the rifle.

Guy searches hills with binoculars. Sees the sniper. Now the other people know where the sniper is.


And for Evony....

Guy gets attacked by ninja...people know there is a ninja.

Guy sees a ninja...people know there is a ninja.