BurNs—Own Broap-wIncep HAwK. 243 
North, Minn., states that “ during the mating season (which 
begins about the first week in May), the clear, shrill screams 
constantly echo in the dim woods, as one answers back to 
another from some chosen perch.” Rev. Peabody observed 
“at the margin of a field, a pair copulating, the male swooping 
down upon his mate as she rested lightly in a sapling top.” 
Mearns, Cantwell and Swales have found the adult mated to 
an immature. in one or more instances. 
Situation or Nest—Almost every variety of forest tree 
has been utilized at one time or another, but the most abundant 
or characteristic species of the locality is apt to be the favor- 
ite. In central Alberta it is found in birch or poplar. In 
the vicinity of the Muskoka lakes, Ont., Spreadborough al- 
ways found its nest in the large black birches; while White 
found it to prefer a hemlock ior swamp ash near Ottawa, and 
Young of the same Province, states that the black or yellow 
birch seems to be the favorite. In Maine, New Hampshire, 
and Vermont, yellow birch is used more than all other species 
of trees combined, and as one collector writes, most of them 
are pretty difficult to climb. Jn the western part of Bristol 
Co., Mass., it seems to prefer to nest in chestnuts, though there 
are numerous groves of white pine. In the eastern part of 
Bristol Co., and Plymouth Co., where the large tracts of 
heavy timber are principally white pine and where chestnuts 
are rare or almost unknown, it nests almost invariably in the 
pines, though oaks are frequently available (Bent. ms.). 
In Rhode Island, Connecticut, New York and Pennsylvania. 
chestnut is the favorite, with more than an occasional beech, 
hemlock, oak, maple, birch, or hickory. Babson of Princeton. 
N. J., found the several nests which came under his observa- 
tion, to be in low oaks. Renova, Clinton iCo., Pa., the oak, 
maple, black birch and chestnut are chosen, never an ever- 
green (Pierce ms.). Fleetwood, Bucks Co., Pa., all have been 
in chestnut ‘trees (Liebelsperger ms.). In Chester Co., Pa., 
it has a strong preference for the chestnut (Sharples ms.). 
Shufeldt describes a nest in Maryland, near Tacoma Park, 
fifty feet up in an‘ill-shapen oak with short crooked limbs, in 
