Hiya :3, i am just curious about this behavior my guine pig does as he is the only guinea pig ive had ever do this. As you can see in the photo my gray guinea pig Ares (after the greek god) enjoys sitting on top of the tunnel. Its quite cute and amusing because he will just walk over to the tunnel and sit there like the photo for around 5-7 minutes. None of my other pigs do this so i am rather curious if anyone has an idea as to why he enjoys sitting like this. He also does it rather often, random times throughout the day he with just chill on top of the tunnel.