WARM-WEATHER BIRDS. 25 
line and its parallel; those which come from Michigan 
sweep down Lake Michigan and enter the Fox Lake 
region, work northward over the chain of Fox, Grass, 
Marie through Wisconsin up to Lake Koskonong, 
stay three or four days and come back over the same 
grounds and head down the Illinois River, or over 
Calumet, Hyde, Wolf, etc., down the Wabash. The 
ducks of Northern Minnesota by this time, with oth- 
ers from North Dakota and Michigan, have come 
down and make the second issue; all of these ducks 
are not yet in full plumage. Those hatched over the 
boundary line come down in the same manner, after 
the local birds of the Dakotas, Minnesota and Michi- 
gan have gone; but by the time they arrive between 42° 
and 38° are full fledged, with green heads, the green- 
heads of the mallards of the local ducks being spotted 
with green only. 
The feeding grounds south of 42° are in the Ever- 
glades, timbered ponds, where smartweed abounds 
along the large rivers, also over a great part of Michi- 
gan; but after they leave the timbered streams and the 
oakmast falls short, they spread over the barley fields, 
rice sloughs, musquaids, etc. Their roosting grounds 
are in ponds, inlets surrounded by timber or buck- 
brush, rice, willows and heavy grassy musquaids, 
Their playgrounds are in open water, in holes and all 
through timber under water, as the Everglades, wide 
water covered here and there with flags, rice, buck- 
brush, willows, etc., where they can rest without dis- 
turbance, hidden from view by the heavy cover exist- 
ing there. Their nesting grounds are in grassy ponds, 
sloughs, buckbrush, flags, wild rice near water in the 
