PIBO Migration Summary


April 16th – 22nd, 2012



Worm-eating Warbler



Migration activity was fairly low-key early in the week due in part to some cool weather and strong north winds, although there was a noticeable upswing towards the end of the summary period. Seventeen spring ‘firsts’ were recorded from April 16th – 22nd along with increased totals for a range of familiar species including Hermit Thrush, Yellow-rumped Warbler, and White-throated Sparrow. New arrivals for the Spring included Virginia Rail, Greater Yellowlegs, Gray Catbird, Wood Thrush, Black-throated Green Warbler and Ovenbird, among others.


Water birds numbers have been down this spring compared to previous Aprils, although Horned Grebes made a good showing on April 18th, with 45 individuals noted on the census, along with 190 Red-breasted Mergansers. A Sora and Virginia Rail were calling from Fox Pond from the 20th– 22nd and a few dabbling ducks remained in the area including small groups of Blue-winged Teal and Mallard.  


Diversity increased steadily from the 19th – 22nd and 43 species were recorded on April 21st inPIBO’s official count area including Blue-headed Vireo, 51 Tree Swallows, Eastern Bluebird, 10 Hermit Thrushes, Pine and Black-throated Green Warblers, and 58 White-throated Sparrows. Forty-seven species were tallied on the final day of the summary period including a bandedWorm-eating Warbler. A nice range of other neotropical migrants were also observed that day including four additional warbler spp. – Yellow-rumped, Palm, Pine, and Ovenbird.



PIBO’s next summary will be posted on May 2nd.



Photo: Sumiko Onishi