Hi, we have 4 red earred turtles that have lived inside in very large tanks for 17 years (oldest ones). We have finally moved to a place that we could build them a pond. They have been outside (and loving it) since November. However now we are heading into winter we are concerned about hibernation, as we dont want to lose any over winter. We are in Hamilton. Can anyone give us some advise. I have heard about barley straw - but dont really know much about it. We dont really have a layer of mud at the bottom, so am concerned about what they could burrow into. We just worry as they have been indoors all their lives, so would appreciate any help. We have thought about bringing them back inside for the winter months, but I would really rather not, depending what advise we get from you all