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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. [639]-Plate 22 ff. PDF (8.1 MB)


Page 648


I
I
648 Wiscoisin Academy of Sciences, Arts, and Letters.
Nests here were placed under or beside driftwood, on the
open gravel, or amongst the small patch of sedge and grass
at the northeastern end of the island. Half a dozen nests
contained each one to three eggs, all incubated; and one
egg of a set of two was hatching at 5:00 p. m. A few
downy young were encountered, and others half to two-
thirds grown were more prevalent. Fishermen Shoal was
not visited, but it is reported by sailors and fisherman to
support one of the principal nesting gull colonies in that
part of Lake Michigan. On Hat Island, in Green Bay, July
25, about five hundred adult gulls were found. Only two
nests containing eggs were discovered, one with one egg
and one with two. The young in nearly all cases were able
to fly well. Of the Strawberry Group, a very few gulls
breed on Big Strawberry Island, and only a few more on
Little Strawberry Island. On Jack Island, however, is the
largest gull rookery in the region, there being fully eight
hundred, and more probably one thousand, adult birds on
the island at the time of our visit. Very few nests with
eggs were found here. The great majority of young were
well able to fly, and were flying about the island or congre-
gating in flocks out on the bay. Many young were found
in the long grass and nettles which cover the central part
of the island, or among the rocks, most of such birds being
fledgings about one-third grown.  (See plate 22, figs. 2, 3,
and 4.)
   There was some little variation in the nests examined,
 which was most pronounced in the matter of bulkiness.
 The nests were composed for the most part of coarse dry
 sedge and grass, a few sticks, and "sea-weed," varying
 somewhat in proportions. A few feathers, plucked or
 molted from the adult, were scattered in and around each
 nest, apparently increasing in abundance with the increased
 age and use of the nest. In external diameter the nest was
 from ten to eighteen inches, and in height two and one-half
 to four and one-half inches. Internally, the hollow of the
 nest was seven to eight inches in diameter, and one and one-
 half to three inches in depth. The majority of the nests
 were clumsily concealed under or beside a rock, log, or bush,
 though the nesting sites varied some in the different Colo-
 nies.
   In the s
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 interesting
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 The ordi
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