Of the approximately 500 crayfishes (some times called crawdads or crawfish) found on earth, about 400 crayfish species live in waters in North America, and about 353, nearly 70 percent of the world’s total species, inhabit waters in the United States.

The Virginia Master Naturalist program is a statewide corps of volunteers providing education, outreach, and service dedicated to the beneficial management of natural resources and natural areas within their communities.

This publication provides an overview of the study of mammals in Virginia. It includes an up-to-date listing of mammals found in Virginia and information on the biology and natural history of mammals. The intended audience is Virginia Master Naturalist volunteers and others seeking to gain a basic understanding of this topic.

Virginia Master Naturalist volunteers are well-positioned to help more people of all ages and backgrounds to have regularly occurring, meaningful experiences in nature that meet their personal interests and needs. As volunteer educators, they may provide interpretive talks, lead interpretive walks, develop interpretive brochures and signage, and give formal presentations. The foundation for all of these forms of education includes knowing one's audience; planning topics, themes, goals, and objectives; background research and preparation; communicating clearly; and evaluating. This publication describes these key concepts and provides step-by-step guidelines for planning interpretive programs and other educational interactions.

Volunteer teachers are important to Virginia Cooperative Extension (VCE). Volunteers convey information on a variety of topics by teaching or assisting with programs. Although there are many methods for delivering content, this publication will focus on a selection of teaching techniques to foster dialogue.