Hawk Migration Charts

Corrections to the Meadowlark article "Five years of hawkwatching at Illinois Beach State Park: where are we now?"

Total hours per year

Figure 3 (above): Total hours per year. The trend in this case is significantly upwards, although it will probably level off in the future.

Osprey yearly passage rates Sharp-shinned Hawk yearly passage rates
Merlin yearly passage rates Peregrine Falcon yearly passage rates

Figure 4 (above): Yearly passage rates (birds/100 hours) for the following species: Osprey, Sharp-shinned Hawk, Merlin, and Peregrine Falcon. Trend lines are not significant.

Osprey totals Sharp-shinned Hawk yearly totals
Merlin yearly totals Peregrine Falcon yearly totals

Figure 5 (above): Yearly totals, predicted totals, and the ratio between the two for the following species: Osprey, Sharp-shinned Hawk, Merlin, and Peregrine Falcon. Ratio values well below 1 may indicate a declining population.

Hawk Migration Charts

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