Here is Katie and I on our visit to the Sterling Hill Mine in Ogdensburg, NJ.
The mine is part of the old and abandoned New Jersey Zinc Mine,now the Sterling Hill Mining Museum. Bats use abandoned mines as wintering habitat because the air temperature underground is constant at about 49 degrees all winter - cool enough for hibernation but not cold enough to freeze them. Mines in all states have become very important for hibernation and efforts are underway to protect them to allow the bats a place for the winter.
Often the bats that use these locations migrate several hundred miles in the spring to "summer roosts" where they have their pups and live until fall approaches.Kestrels are used to measure the environmental conditions in the mines and an integral part of the bat research.
Thanks so much John and Mitzi for an enjoyable day!