Tresco, the only privately owned island in the Isles of Scilly, is home to the famed Abbey Gardens, created in the 19th century around the ruins of a Benedictine priory. Among the subtropical plants, red squirrels thrive here, carefully introduced to the island as part of a conservation effort. These photographs capture their presence in the gardens — from a flash of a tail in dappled light to a moment of stillness on the lawn.