Short guide, in which I'll show you the locations for the challenge Keep Calm and Carrion.
What Do You Have to Do?
Keep Calm and Carrion is one of the side challenges in.
This challenge can be completed in the hidden city. In this challenge you'll have to gather 3 condor feathers from bird's nests.
The first nest can be found right after you entered the hidden city. It is located on a roof.
The next nest is a bit more difficult to find. There should be a tree near the lake, where you can climb on. Then you have to climb as high as possible, until you reach the point shown on the map down below.
The next, and also the last nest can be found on a ledge, which is located near the base camp. There is also a big temple or tomb, where you won't be able to enter. To reach this nest you'll have to use your axe.
After gathering the last feather's, the mission is complete. You'll now earn 80 XP.