To be ASU D0 BO Ni Beeb GE TPN 3 
region. Clark and Nice (1950) have also noted frequencies for the nearby 
Lincoln Park area. Hence we prepared a graph (figure 2) to show only the 
frequency of our observations. 
Frequency percentages are incorporated into the following annotated 
list. The conventionally prepared skins and frozen specimens are in the 
collection of the University of Illinois, Chicago Undergraduate Division 
(UIC). The following abbreviations are used: 
SU — in front of the species name ........ seen in summer (July and August) 
* __in front of the species name ........ seen in fall & winter (Sept. to Jan.) 
-- — in front of the species name .........4...0... nesting or attempted nesting 
ee ich aes cy act cy nu ccttace iebtns ov Nd thule thai gin Omens Coc abina ow bs Navy Pier 
a i ae pe i ARO CORR a Se nO oF reli ot SPRUE! Navy Pier Park 
The numeral after the species name js the spring frequency index. Early 
or late dates are given only when they constitute new records for the 
Chicago area as a whole (based on Ford). 
ANNOTATED LIST OF SPECIES 
*COMMON LOON — Gavia immer 
Seen only once — Dec. 2, 1956 — four noted just off the mainland at the 
west end of NP. An adult in breeding plumage, UIC 60058, was found 
on Apr. 16, 1949, at NP. 
*HORNED GREBE — Podiceps auritus 
4%. Seen only once in winter, Dec. 2, 1956. 
*PIED - BILLED GREBE — Podilymbus podiceps 
4%. One seen Nov. 2 to 19, 1953, south of NP. Between Dec. 4 and 22, 
two were seen in the above area. 
*DOUBLE-CRESTED CORMORANT — Phalacrocorax auritus 
5%. Many spring 1953 records were of birds perched on pilings north of 
NP. These posts have since been destroyed. Our only fall record (Oct. 
12, 1958) is a flock of 19 or 20 birds flying south. 
SU—GREAT BLUE HERON — Ardea herodias 
Seen twice (July 29 and Aug. 5, 1954) when 26 and 11 birds, respectively, 
were standing on the breakwaters. 
GREEN HERON — Butorides virescens. 1%. 
SU—BLACK-CROWNED NIGHT HERON —Nycticorax nycticorax 
Seen once flying off breakwaters in summer by the late Dr. Alfred Lewy. 
AMERICAN BITTERN — Botaurus lentiginosus 
2%. One was taken on May 21, 1953, in the center of NP. 
CANADA GOOSE — Branta canadensis 
1%. On Apr. 29, 1958, a flock of 44 birds was seen flying south in the 
afternoon. The birds bunched up over Lake Shore Drive, assumed a “V” 
formation, and then flew north. This is our only record. 
SSNOW GOOSE and *BLUE GOOSE — Chen hyperborea & C. caerulescens 
On Oct. 28, 1958, a mixed flock of 50-70 Snow and Blue Geese was 
seen flying south over NP to the area between NP and the Chicago River 
locks. At this point they flew east over the lake. 
*1 MALLARD — Anas platyrhynchos 
30%. Many of these birds may be semi-domestic ducks from Lincoln 
Park. Since the construction of the coffer dam in 1954, Shank has seen 
females and young just off the west end of NP near the cafeteria, where 
they take food offerings. As the summer passes, the number of young 
dwindles, presumably because of the predatory rat population. 
*BLACK DUCK — Anas rubripes 
1%. Dec. 2, 1956, and Feb. 23, 1953, are our only records. 
