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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 650

650 Wisconsin Academy of Sciences, Arts, and Letters.
young up to two-thirds grown gathered on the bars at the
ends of the islands, or sometimes in the water in com-
         pac flcks  Tey  ppere tobe naie to iiy u-ii ve
       'IF r
MeT gus se
  The "sa
pact flocks. They appeared to be unable TO nly Until over       ac   -a
half-grown, and, although they fluttered and flapped their      of the isle
wings in an attempt to rise both from the land and water,  I    mon bree(
their effort was extremely  clumsy  and  ludicrous. The         Clark Lak
full-grown young of the year flew slowly and clumsily in  I     came dow:
comparison with adults, which was accentuated by their   ,      downy yo
larger appearance due to their dark color against the sky.      hurried o
  Crayfish (Cambarus) seemed to form an important food          toward sh
of the herring gull and the nesting rookeries in many           so success
places were strewn with the hard parts of this animal.          not be dis
Crayfish were also found in the stomachs of adults, and         southern
were seen regurgitated by them. One adult had two large         feeding n(
minnows (Notropis) in its oesphagus. It is probable that        ous pairs
many of the crayfish were captured alive by the gulls, a        doned dus
there were too many remains of them on the islands for all      were seen
to have been taken as carrion.                                         protecting
 [Chroicocephalus philadelphia (Ord). Bonaparte's Gull.         where sev
   A "little black-headed gull" which answers the descrip-
 about tw(
tion of Chroicocephalus Philadelphia was reported by           twenty, Ji
fishermen to occur in this region in spring and fall.]         female wi-
Hydroprogne caspia imperator (Coues). Caspian Tern.
  This beautiful tern was occasionally seen flying over the
water near Washington Island, and in Porte des Morts
Passage (July 15, 1917). The only colony encountered was
on the Spider Islands, where there were fifty or sixty
birds. One of them was collected. Old nesting places
were evident on Little Spider Island, where broken egg
shells resembling parts of Caspian terns' eggs were found,
and where a few old nesting hollows encircled by rem-
Iold perch
  on the ish
  berry, anc
  and Big S
  male mer
  rocks, bru
  dled towai
  the bay.
  to locate i
nants of the characteristic rings oi small WLIVllUo                     ays
shells were discovered. The adult birds hovered overhead              island;
in a flock as if still breeding, but we found no nests con,
taining eggs or young. A few young birds well able to fly             Anas
were with the flock.                                                    A
  There were no signs of terns on Gravel Island, where                than
Ward found them breeding in July, 1905, but which they                Lake,
had abandoned the following year (1906).3                             ington
  War1d, Henry L. Bull. WANisconsili Nat. Hist. Soe., X ol. 4, P. 1  one
mile n

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