Engineers in a nutshell

If y'all ever played or is playing TF2, you all probably seen a engies nest or two. This is what it looks like in a nutshell. :3
Origins is found in The Spy's guide on youtube.

Fellow Engineer's and tf2 players, Join the Gibus Engineers Wildlife Protectors. Together we can protect the helpless Gibus Engines so they can raise lil sentry's to level 3. steamcommunity.com/groups/gewp…