As opportunities permit, I have been monitoring the passage of waterbirds and other migrants along Lake Michigan again this fall. Although I have been only able to cover about an hour each day, I have counted on 19 days since September 12. All watches have occurred at Hoffmaster State Park.
During the last few days, overall
numbers and diversity have increased substantially. So far this
season, I have recorded 10 Red-throated Loons, 72 Common Loons, and
87 Horned Grebes. Totaling 403 individuals, Bonaparte's Gulls have
been passing regularly, but the count of 241 from October 14 remains
the peak. Common Terns, last seen on October 15, numbered 32. A northbound jaeger seen on September 22 could not be conclusively identified.
Long-tailed Ducks were first noted on October
15, and October 28 was the first day that I saw more than 100. Other
diving ducks have also dramatically increased - counts of 239
Red-breasted Mergansers and 53 Bufflehead on October 29 were quite
higher than previous days. As for scoters, I have seen 23 Surf, 63
White-winged, and 13 Black so far. The most numerous dabbling duck has been Gadwall.
A southbound Red Phalarope on October
29 was a nice treat, but more surprising was an American Woodcock
flying east toward the dunes at 10:49 a.m. on the same day. Similarly, both
in the spring and fall, large numbers of eastbound passerines regularly appear
from far over Lake Michigan. In the past couple days,
dozens of American Pipits and Snow Buntings (first seen October 24)
have arriving from the west.
Due to their small sizes, these birds
can be difficult to detect, but the gauntlet of gulls and a resident
Merlin have been more discerning. After struggling miles over the
lake, many passerines are seized within a stone's throw of the
shoreline. The latest victim was a Golden-crowned Kinglet
effortlessly captured by the Merlin on October 29. However, these
attacks are not always successful, and one of the Red Bats I saw
arriving over the lake repeatedly dodged and ultimately eluded the
determined raptor.
- Brian Johnson
- Brian Johnson