I had a few hours to bird along the Olentangy River corridor today (Worthington greenbelt + Antrum Lake) and was struck by some of its differences with the Alum Creek and Big Walnut Corridors that I visited the last 2 days.  It had quite a bit fewer migrants, especially diurnal ones.  Just for a quick comparison, here are some of the totals comparing it with Alum Creek Lake (Sun) and NorthHoover-BigWalnutDelta (Sat):

Flickers -  3 (BWD), 8 (ACL), 4 (Olentangy)
Sapsuckers - 2 (BWD), 5 (ACL), 1 (Olentangy)
TreeSwallows - 300+ (BWD), 200+ (ACL), 0 (Olentangy)
Kinglets - 6 (BWD), 10 (ACL), 2 (Olentangy)
BlueJays - 30 (BWD), 90 (ACL), 10 (Olentangy)
Robins - 40 (BWD), 50 (ACL), 10 (Olentangy)
Swainson's Thrushes - 5 (BWD), 7 (ACL), 3 (Olentangy)
CedarWaxwings - 120 (BWD), 150 (ACL), 10 (Olentangy)
WarblerTotals - 40+ (BWD), 40+ (ACL), 5 (Olentangy)

I'm not sure if birds are intentionally avoiding the more urban Olentangy corridor, but I've not seen this kind of drop-off before.  Times & wild food crops seemed comparable, so some of it may just be due to the vagaries of different days.  If you pull out Yellow-rumped warblers, which are diurnal migrants, the warbler totals get a little less skewed, suggesting that the biggest differences are among flocking diurnal migrants like Robins, Jays, and Waxwings. These birds may be visually avoiding the more urban corridor, despite the presence of plenty of food in the Olentangy parks.

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