The Audubon Society of Western PA will have its first Butler Bound 5k Fun Run/Walk at 10 a.m. Saturday on the Butler-Freeport Community Trail. In addition, a day of watery fun is planned while exploring the Ravine Trail at Todd Nature Reserve, Sarver, at noon Sunday. Call 724-353-9012.

Bartramian Audubon Society will have a birds and nature festival May 1, 2 and 3 in the Franklin-Oil City area. Nature hikes, bird walks, workshops and an owl prowl are in the works. Call 814-437-5858.

Jennings Environmental Education Center will host A "Battling Invasive Species" work day from 9 a.m. to 1 p.m. Saturday; registration is necessary. A two-day fly fishing clinic will be held from 10 a.m. to 3 p.m. May 16 and off-site on May 17 for those age 10 and older. The fee is $15 and registration is required. Jennings is open 8 a.m. to 4 p.m. weekdays and on weekends as scheduled. The trails are open daily from sunrise to sunset. Call 724-794-6011.