156 Bulletin Wisconsin Natural History Society [Vol. 13, No. 3 
Ixobrychus exilis (Gmelin). Least bittern. 
Not uncommon in zone five, where it remains almost con- 
stantly, feeding and nesting therein. Stomach examination 
of six adults showed the following species eaten: Acris gryllus. 
Chorophilus nigritus, small Rana pipiens , and Zaitha, with 
various other aquatic insects. 
Fig. 8. Arched Nest of Least Bittern. 
Ardea herodias herodias Linnaeus. Great Blue Heron. 
A frequent early spring migrant, found in zones four and 
five. The stomach of one individual found shot along the lake 
shore contained two Rana pipiens and several Notropis heterodon 
and Fundulus. 
Butorides virescens virescens (Linnaeus). Green Heron. 
Found not uncommonly in zone five, where the species nests 
in the Cornus society. 
