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Newsletter Get the latest information on Upcoming Events Yes I am over 18 years old or have my legal guardians approval to signup Great Hollow Established in 2016 the Great Hollow Nature Preserve Ecological Research Center is a 501c 3 nonprofit organization that is dedicated to biodiversity conservation applied ecological research experiential environmental education and passive outdoor recreation. Our staff and collaborators conduct integrative conservationdriven studies of wildlife and plants within and beyond our preserve. Great Hollow also runs numerous education programs for both children and adults throughout the year including school programs and a naturebased summer day camp. Our 825acre preserve and five miles of hiking trails are open to the public yearround for the exploration and enjoyment of nature.