2 Tino EB. AU: DU BON) BOUL i Pera 
Navy Pier Park, a little over 600 feet long (east to west) and 250 
feet wide, is divided into east and west halves by a partially trellised walk. 
The park includes a number of trees and shrubs, flower beds, and a fair 
extent of lawn. 
Southwest of Navy Pier is a large quonset-type structure used by the 
University of Illinois for a men’s gymansium. (The University of 
Illinois, Chicago Undergraduate Division, has used part of Navy Pier for a 
temporary campus since 1946). ‘South of the gymnasium, across Streeter 
Drive, is a small open area covered with grass and a few weeds. This 
is particularly attractive to various sparrows. The gymnasium itself is 
surrounded by a gravel parking lot with strips of grass. In the earlier 
years of our study, the grass area was more extensive and was the site 
of trapping operations by Mr. Shank. Between the northwest corner of the 
gymnasium and Streeter Drive is a small stone building surrounded 
by shrubbery which harbors many species. 
The east end of Navy Pier has a walk on three sides, and the area 
between the north and south buildings of the Pier has balconies which 
are attractive to birds. Until 1954 there was an old carrier pier just south 
of Navy Pier. The south dock of pier no. 1 is a series of pilings and 
connecting planks on which gulls rest. North of Navy Pier is a water 
filtration plant which has been under construction since 1954. The 
coffer dam attracts many gulls, terns, and Mallards. Lake Michigan 
surrounds the area on three sides; the water at the mouth of the Chicago 
River and Ogden Slip are part of the fourth (west) side. 
METHODS 
This report covers the years 1953 to 1960. The records 
were obtained during walks by us and by bird study classes 
of the University led by Shank. Other records were obtained 
mainly from Mrs. Amy G. Baldwin and Mrs. Nelda McQuate 
Holden. The help of all observers is gratefully acknowledged. 
We wish also to acknowledge Mr. James Bond’s assistance 
with statistical problems. Spring trips were made during 
February to June in 1953, 1954, and 1957 to 1960. The sum- 
mer, fall, and winter records were made during 1953 to 1955 
and sporadically in 1956, 1958, and 1960. Few trips were 
taken on weekends or during vacations. 
The same areas were usually covered; however, occasion- 
ally only portions of the larger area were visited. An accur- 
ate count of individuals was not always kept. Because of 
these variables, we decided to concern ourselves with fre- 
quency, where the number of days a species is seen is the 
unit, rather than abundance, where the number of individuals 
is the unit. The number of days each species was seen was 
divided by the total number of field trips (138) and multi- 
plied by 100. Since most walks occurred during the spring, 
when the birds study classes 
were held, frequency was de- 
termined only for this season. 
We felt that the terms 
3,  vare, casual, common, etc. 
had no meaning for such a 
small area. Ford (1956) has 
FIG 2. FREQUENCY GRAPH FOR SPECIES noted the relative abundance 
SEEN IN SPRING of each species in the Chicago 
yc weber of Species 
2l Sil 4] 51 6! 1H! 
Fr eqguency Cin per centages) 
