Can I mirror animations on bones? I have a model of a dragon. It's mesh was made by mirroring and also was it's bones. I want to animate a wing, but want to make the other wing to animate equally, but mirrored. Is it possible?
I'm new to blender, so I need a bit more detailed explanation.
Try copying the pose, then pasting x-mirrored= shift+Ctrl+V.

You can copy the pose in the pose menu, right next to the mode changing button. 

See the one that says Pose?



Once you copy a pose (Copy Pose) you can either paste pose or paste x-flipped pose.