421 
NUMBERS AND PER CENTS OF NATIVE BIRDS 
Numbers 207 115 489 392 1203 
Per cent. 17.2 9.6 40.6 32.6 100 
NUMBERS OF THE Morr ABUNDANT BrRpDS, WATSEKA TO 
Fiat Rock, Marcu 29 ro Aprit 5, 1907 
Ratio to total 
No. of each NO. 
Meadowlark 175 13.6 
Buff-breasted sandpiper 170 13.2 
Smith’s longspur 96 7.4 
English sparrow : 91 7.0 
Pipit 82 6.3 
Field sparrow 78 Bene 
Bluebird 68 5.3 
Vesper sparrow 58 4.5 
Lapland longspur 55 4.3 
Junco 52 4.0 
Flicker 48 3.7 
Prairie horned lark 39 3.0 
Mourning dove 28 2.2 
Robin 22 a Weg 
Crow 21 1.6 
Cowbird 20 1.5 
Crow blackbird 15 1.2 
Savannah sparrow 15 1.2 
All birds per square mile fits) 
Turning now to the southern Illinois division (April 6 to 11) of the 
eastern Illinois trip, we find that although the number of species re- 
corded was the same as for central Illinois, the effect of a lower latitude 
and slightly later date is shown in a number of birds, (1004 to the 
square mile), 37 per cent larger than that of the central Illinois list of 
the week before, and materially larger than thai of the summer seasons 
of 1907 and 1909 (925 to the square mile). The principal winter spe- 
cies remaining were the savannah sparrow and juncos, and there was 
also a sprinkling of tree sparrows, golden-crowned kinglets, and four 
other species to be clasesd as winter birds in southern Illinois, the total 
number of this class amounting to 12 per cent of all the birds seen. 5.7 
per cent were of migrant species, of which the pipit was much the most 
abundant, but about four-fifths of these April birds were permanent or 
summer residents, 65.5 per cent of the first and 15.7 per cent of the 
second. The ratio of permanent residents was nearly as large as in 
the dead of winter (see p. 403) and the 31 per cent of winter residents 
of that season were now represented by 12 per cent., the remainder 
being replaced by migrants and summer residents. 
