They REALLY are amazing!!!!!!we started out the december averaging 5 degrees below normal , we've had quite a few days with near zero lows and highs in the low teens ....... it warmed up pretty good the last few days , I think we have a 60 in the 5 day forecast .......... Kevin , they pop up on sunny days throughout the winter , I've seen them in the sun on the bottom of the pond on single digit sunny days ....... when they come up it appears to me to be just for a breath , they go back down and you won't see them for weeks , they never come out the water until maybe may ........ it is amazing to me to see reptiles as cold tolerant as na wood turtles and blanding's are ..........
I googled it ..... some of them videos make it look like mine are wintering in mexico .......
There was a guy who filmed dormant map turtles under the ice. I think he was in Michigan, or Wisconsin. One of those ridiculously cold places.
Not sure where I watched the video now though...Turtle Forum, maybe Field Herp Forum?
Berkeley probably knows.