Alewives and ospreys migration walks will be offered three Saturday in May, hosted by Upstream’s new natural history guide, on Cobbossee Stream in downtown Gardiner.

The walks are scheduled for 7 a.m. May 11 and 18, and at 10 a.m. May 25.

Those interested should bring binoculars and join Maine Master Naturalists, Augusta Bird Club and Upstream in a one-mile hike to discover early morning warblers and returning migrants to Cobbossee. The walk will take participants through Gardiner’s historical past along the stream, as ospreys, alewives and eagles may be spotted. Those who attend should park at New Mills Parking lot on Cobbossee Avenue (Route 9/126).

For more information, contact Tina Wood at 582-0213 or upstreamcobbossee@gmail.com.