A movement under the shore stopped my wondering, and the long lithe form of a hunting mink shot swiftly up stream. Under the hole he stopped, raised himself with his fore paws against the bank, twisting his head from side to side and sniffing nervously. "Something good up there," he thought, and began to climb. But the bank was sheer and soft; he slipped back half a dozen times without rising two feet. Then he went down stream to a point where some roots gave him a foothold, and ran lightly up till under the dark eaves that threw their shadowy roots over the clay bank. There he crept cautiously along till his nose found the nest, and slipped down till his fore paws rested on the threshold. A long hungry sniff of the rank fishy odor that pours out of a kingfisher's den, a keen look all around to be sure the old birds were not returning, and he vanished like a shadow. "There is one brood of kingfishers the less," I thought, with my glasses focused on the hole. But scarcely was the thought formed, when a fierce rumbling clatter sounded in the bank. The mink shot out, a streak of red showing plainly across his brown face. After him came a kingfisher clattering out a storm of invective and aiding his progress by vicious jabs at his rear. He had made a miscalculation that time; the old mother bird was at home waiting for him, and drove her powerful beak at his evil eye the moment it appeared at the inner end of the tunnel. That took the longing for young kingfisher all out of Cheokhes. He plunged headlong down the bank, the bird swooping after him with a rattling alarm that brought another kingfisher in a twinkling. The mink dived, but it was useless to attempt escape in that way; the keen eyes above followed his flight perfectly. When he came to the surface, twenty feet away, both birds were over him and dropped like plummets on his head. So they drove him down stream and out of sight. Years afterward I solved the second problem suggested by the kingfisher's den, when I had the good fortune, one day, to watch a pair beginning their tunneling. All who have ever watched the bird have, no doubt, noticed his wonderful ability to stop short in swift flight and hold himself poised in midair for an indefinite time, while watching the movements of a minnow beneath. They make use of this ability in beginning their nest on a bank so steep as to afford no foothold. As I watched the pair referred to, first one then the other would hover before the point selected, as a hummingbird balances for a moment at the door of a trumpet flower to be sure that no one is watching ere he goes in, then drive his beak with rapid plunges into the bank, sending down a continuous shower of clay to the river below. When tired he rested on a watch-stub, while his mate made a battering-ram of herself and kept up the work. In a remarkably short time they had a foothold and proceeded to dig themselves in out of sight.