Learn about beavers and muskrats at the Hudson Highlands Nature Museum on Saturday, August 13 at 10 a.m. Join Environmental Educator Pam Golben to earn about the industrious habits of these two wetland mammals in an illustrated presentation; then explore the world of these valley residents while viewing interesting objects and artifacts. Search for signs of them at the Outdoor Discovery Center. Admission: $5 per person. Museum Members: $3. For information and registration, call 534-5506.