Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XXIII (1927)
Jackson, Hartley H. T.
Notes on the summer birds of Door Peninsula, Wisconsin, and adjacent islands, pp. -Plate 22 ff. PDF (8.1 MB)
| ,Jackson-Summer Birds of Door Peninsula. 649 the | In the short time we were on the breeding grounds it was ass impossible to make a detailed study of the habits of these ~sts interesting birds. Fortunately there are available the in- one vestigations of Ward 1 and Strong-' who have studied inde- Eew pendently the gulls on some of these islands. The brief wo- remarks here presented are therefore of value merely for was comparison of original observations. As one approaches L to j a rookery to within a mile or a mile and one-half, the gulls ,hat first sally forth, a few at a time, to meet the visitor, usually ruly keeping at least fifty yards from the intruder. On nearer two approach of the visitor to their home, the gulls rise and egg circle over the island several minutes, in fact until the in- able | truder is about to land, then fly out over the lake where they bulls settle on the water in a scattered flock a quarter of a mile to on a mile from shore. Occasionally individuals or small the groups return to the island, encircle it, then fly back to ight "sea," this action continuing until the intruder leaves, when ; on most of the gulls soon return to the island. vith The ordinary call note of the adult gull is a sharp, loud vere ke-d', given once or repeated several times. When flying gre- near the breeding grounds the gulls utter an alarm note und which is not so loud as the call note, and usually of lower part pitch, though variable. This alarm note can be best ex- ning pressed by the syllables kfik"-kuk-ku&, or sometimes kfik"- 2, 3, kik-klik-kj", at other times m e r e I y kik'-kii". A few times a single bird was heard to alternate the trisyllable ned, with the bisyllable, but there seemed to be no regularity in iess. the matter. The downy young have a peep not dissimilar dry to that of a downy domestic chicken, but not frequently Ving used. I or The young up to half-grown were easily captured in the each hands. They usually attempted to escape first on land by ased concealing themselves in the grass, or under brush, logs, was or rocks, but upon further approach they would run to the -half water where they swam well, could not or would not dive, the and were easily captured. Young up to one-fourth grown onef did not appear to be particularly gregarious, but the older iests mush, 'Ward, H. L. Notes on the herring gull and the caspian tern (Larus colo- argentatus and Sterna caspia). Bull. Wisconsin Nat. Hist. Soc., vol. 4, PP. 113-134, plates 1-2, 1906. 'Strong, R. AI. On the habits and behavior of the herring gull, Larus argentatfs Pont. Auk. vol. 31, pp. 22-49, 178-199, plates 3-10, 19-20, 1914.
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