We have 2 female bunnies that are 9 months old. They have a large hutch, the bedroom has a small heater in it so its not too cold & the open bit of the hutch is protected from the elements by a cover. One of the bunnies keeps getting the hay from the main part of the hutch & carrying into the bedroom. She then proceeded to go in the run & collect all the loose bits of hay & carry them into the bedroom. Is she nesting? Or is it because its gone colder. She's happily enough & eating etc just acting strangely.