I was on my way up a pretty good size ash tree that hung out over a pool. A squirrel kept running ahead of me whenever I'd start to get close. He finally didn't have anywhere else to go and he took about a 30 ft. dive right into the pool. Swam to the edge, climbed out and took off running. Never seen a squirrel swim before that. Another time we'd taken a good size pick off a silver maple with the crane and a squirrel ran down the trunk of it while the butt of it was still 20 ft. in the air. He got to the butt, kind of looked confused,
and jumped off. He bounced off a log and took off some fur but he seemed to run away ok.