The constant watchfulness of black ducks is perhaps the most remarkable thing about them. When feeding at night in some lonely marsh, or hidden away by day deep in the heart of the swamps, they never for a moment seem to lay aside their alertness, nor trust to their hiding places alone for protection. Even when lying fast asleep among the grasses with heads tucked under their wings, there is a nervous vigilance in their very attitudes which suggests a sense of danger. Generally one has to content himself with studying them through a glass; but once I had a very good opportunity of watching them close at hand, of outwitting them, as it were, at their own game of hide-and-seek. It was in a grassy little pond, shut in by high hills, on the open moors of Nantucket. The pond was in the middle of a plain, perhaps a hundred yards from the nearest hill. No tree or rock or bush offered any concealment to an enemy; the ducks could sleep there as sure of detecting the approach of danger as if on the open ocean.
One autumn day I passed the place and, looking cautiously over the top of a hill, saw a single black duck swim out of the water-grass at the edge of the pond. The fresh breeze in my face induced me to try to creep down close to the edge of the pond, to see if it were possible to surprise birds there, should I find any on my next hunting trip. Just below me, at the foot of the hill, was a swampy run leading toward the pond, with grass nearly a foot high growing along its edge. I must reach that if possible.
After a few minutes of watching, the duck went into the grass again, and I started to creep down the hill, keeping my eyes intently on the pond. Halfway down, another duck appeared, and I dropped flat on the hillside in plain sight. Of course the duck noticed the unusual object. There was a commotion in the grass; heads came up here and there. The next moment, to my great astonishment, fully fifty black ducks were swimming about in the greatest uneasiness.
I lay very still and watched. Five minutes passed; then quite suddenly all motion ceased in the pond; every duck sat with neck standing straight up from the water, looking directly at me. So still were they that one could easily have mistaken them for stumps or peat bogs. After a few minutes of this kind of watching they seemed satisfied, and glided back, a few at a time, into the grass.
When all were gone I rolled down the hill and gained the run, getting soaking wet as I splashed into it. Then it was easier to advance without being discovered; for whenever a duck came out to look round—which happened almost every minute at first—I could drop into the grass and be out of sight.
In half an hour I had gained the edge of a low bank, well covered by coarse water-grass. Carefully pushing this aside, I looked through, and almost held my breath, they were so near. Just below me, within six feet, was a big drake, with head drawn down so close to his body that I wondered what he had done with his neck. His eyes were closed; he was fast asleep. In front of him were eight or ten more ducks close together, all with heads under their wings. Scattered about in the grass everywhere were small groups, sleeping, or pluming their glossy dark feathers.
Beside the pleasure of watching them, the first black ducks that I had ever seen unconscious, there was the satisfaction of thinking how completely they had been outwitted at their own game of sharp watching. How they would have jumped had they only known what was lying there in the grass so near their hiding place! At first, every time I saw a pair of little black eyes wink, or a head come from under a wing, I felt myself shrinking close together in the thought that I was discovered; but that wore off after a time, when I found that the eyes winked rather sleepily, and the necks were taken out just to stretch them, much as one would take a comfortable yawn.
Once I was caught squarely, but the grass and my being so near saved me. I had raised my head and lay with chin in my hands, deeply interested in watching a young duck making a most elaborate toilet, when from the other side an old bird shot suddenly into the open water and saw me as I dropped out of sight. There was a low, sharp quack which brought every duck out of his hiding, wide awake on the instant. At first they all bunched together at the farther side, looking straight at the bank where I lay. Probably they saw my feet, which were outside the covert as I lay full length. Then they drew gradually nearer till they were again within the fringe of water-grass. Some of them sat quite up on their tails by a vigorous use of their wings, and stretched their necks to look over the low bank. Just keeping still saved me. In five minutes they were quiet again; even the young duck seemed to have forgotten her vanity and gone to sleep with the others.
Two or three hours I lay thus and watched them through the grass, spying very rudely, no doubt, into the seclusion of their home life. As the long shadow of the western hill stretched across the pool till it darkened the eastern bank, the ducks awoke one by one from their nap, and began to stir about in preparation for departure. Soon they were collected at the center of the open water, where they sat for a moment very still, heads up, and ready. If there was any signal given I did not hear it. At the same moment each pair of wings struck the water with a sharp splash, and they shot straight up in that remarkable way of theirs, as if thrown by a strong spring. An instant they seemed to hang motionless in the air high above the water, then they turned and disappeared swiftly over the eastern hill toward the marshes.