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A large crowd of people walk through the many booths at Beaver Festival VI in Beaver Park in Martinez, Calif., on Saturday, Aug. 3, 2013. (Dan Rosenstrauch/Bay Area News Group)

Visitors to Beaver Festival VI in downtown Martinez, above, look over the bridge at a beaver dam in Alhambra Creek. Kits had appeared in the creek just a week before the Saturday festival, which featured wildlife experts, teachers, scientists, music, artists and entertainers. There were guided creek tours, games and hand-on projects for youngsters. Michael Haase, 4, of Martinez, left, reaches out to touch Alexandria Kerekez, from the Guadalupe River Park Conservancy in San Jose, who was dressed up like a beaver.