Did Ja Know?
Thirty years ago, 26 bald eagles were counted by bird watchers over about 200 hours as the birds migrated south along the edge of Lake Superior over Hawk Ridge in Duluth. This year, thanks to laws banning the use of DDT and PCBs that allowed eagle populations to recover, counters expect see about 4,000 eagles over 350 hours. This amounts to about 11 eagles per counting hour versus 0.1 eagle per hour in 1976.
Source: Hawk Ridge Bird Observatory
By Sea Grant Staff
October 2006
