Christie will be leading a winter walking tour of the Levene and Castlebrook properties from 11 a.m. to 1 p.m. at the preserve.
The gorge is at 167 Mianus River Road.
Participants will also learn how to spot signs of wildlife, such as bobcats and coyotes, Christie said.
To sign up, RSVP by Friday by emailing info@mianus.org, or calling (914)-234-3455.
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