if anyone else has this problem - I had the same as in the pictures (all curves, very small lower hole so the tunnel does not stand up but wants to roll / fall over). But I turned the tunnel over and wedged it under the hay rack in my chinchilla cage and enlarged it with a tube with a hole in the side. My chin LOVES IT! It's so cute he loves to sleep on it and use the hole as a pillow/head rest (if only I could take a picture he moves every time). He likes it because it smells delicious and has a built-in headrest. I like it because the space in the branch structure allows for ventilation while it sleeps so it doesn't overheat.
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