100% hide, they rely on security and get stressed very easily, a hide is needed!!! two if possible, one on the cold side and one on the warm so they dont sacrifice security for thermoregularity.
Hides are not absolutely needed. I've got plenty of balls that don't have them and don't need them...
Lucifer Sam, Siam cat...
Always sitting by your side,
Always by your side...
That cat's something I can't explain...