"Key Responsibilities: Trained volunteers conduct a standardized count of this spectacular migration of
raptors at the lower Detroit River..." Detroit River International Wildlife Refuge, U.S. Fish & Wildlife Service.
"A standardized monitoring program - the Detroit River Hawk Watch - is conducted by the U.S. Fish and Wildlife Service (USFWS), the Detroit River International Wildlife Refuge (DRIWR), and its friends group, the International Wildlife Refuge Alliance (IWRA), at the Lake Erie Metropark in Gibraltar, MI. Join us at the Boat Launch and witness spectacular flights of Broad-winged Hawks, Turkey Vultures, Sharp-shinned Hawks, and both Bald and Golden Eagles! See the Calendar of Hawk Movement below for numbers and types of raptors expected each season..." Detroit River Hawk Watch.