That eagle has a couple clips under the edges of the wings. The dental floss is also to try, (TRY), to flex the eagle enough to get the plastic clip to release. If someone is determined to remove it, it is prudent to have spares in case you break them. As you can see, there is a left and right. IIRC they are about 17 bucks each. Like Dan said, no real need to remove the side covers for any reason than to remove the side covers.
John Henry