Plenty of signs of Spring at Heinz refuge in Philadelphia in the form of early migrants and early nesting activity.
A particular treat today was the presence of a pair of Blue-winged Teal, which I have found to be uncommon on the mid-Atlantic coast and rare in Vermont.
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| Blue-winged Teal | 
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| Blue-winged Teal - pair | 
 The eagles appear to be on the nest, but too distant for any photos. In the early migrant category, Eastern Phoebes are "fee - bee - ing", and a flock of Pine Warblers proclaimed their buzzy presence ...
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| Eastern Phoebe | 
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| Pine Warbler | 
In the early breeding/nesting activity category, there was vigorous singing by cardinals, Song Sparrows, blackbirds, and robins. A mallard hen was on the nest while her mate kept wary watch nearby.
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| Mallard - hen on nest | 
American Tree Swallows were staking claim to nest boxes and actively seeking to pair bond.
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| American Tree Swallows | 
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| American Tree Swallow | 
Carolina Wren males were singing with enthusiasm. I observed several individuals who were giving a buzzy call, were not singing, and who appeared to be in early stages of finding/building nests in hidden places.They were also less richly colored. I suspect these were females. 
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| Carolina Wren (female?) | 
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| Carolina Wren (female?) | 
 
A good opening chapter to the season of really Good Birding!!