Onlookers were delighted after a black bear was spotted swimming across the Piscataqua River from New Hampshire into southern Maine. What happened? WGME reported that the animal was spotted Saturday as it left New Castle, New Hampshire, and headed toward Kittery, Maine. After receiving a call, Kittery Harbormaster John Brosnihan went out by boat and found "the bear's little head sticking out of the water, and he was swimming toward Fort McClary,…