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Walter T. “Wally” Vait, a conservationist and accomplished fly fisherman, died June 7 of intestinal cancer at a daughter’s Roland Park home. The former Delta, Pennsylvania, and Parkton resident was 68.

Newly acknowledged revelations about beavers have opened up a new world of ecological understanding. In the past few decades scientists discovered the supernatural influence of Castor canadensis – the North American beaver – on the landscape