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    Window strikes in southeast PA

    This morning these two birds collided with a second-story window and fell to the ground dead: I think the larger, more colorful one first, followed a second later by the smaller one. What are they? At the time the sun was reflecting almost straight back from the window. Is sun reflection...
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    Why are woodpeckers attracted to this exact spot on my house?

    I live in a development in SE PA surrounded by mature trees. Last October a woodpecker took an intense daily interest in this one second-story corner of my house that had recently been renovated with PVC boards. The property manager tried a number of things to deter it, like hanging out strips...
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    Sexual dimorphism

    Some birds have striking sexual dimorphisms, while others are practically indistinguishable by gender. Is there a clear delineation of the species that do and do not have sexual dimorphism? E.g., do they all happen to fall into the same families? Or are there other characteristics that seem...
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    Songbird this week in SE Pennsylvania

    What species and gender is this?
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    Small bird in suburban Pennsylvania

    Photographs from today in southeast PA. What is it?
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    Small blue bird in Pennsylvania

    Seen this week in suburban area of southeast Pennsylvania. What is this guy? Given its size I am amazed it can survive the recent low temperatures.
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    Scavengers today in SE Pennsylvania

    I've been told guys like the one on the right are black vultures. What are his other two friends?
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    ID - scavengers from SouthEast Pennsylvania

    A flock of around a dozen of these hovered over a dead deer for a few hours in SouthEastern Pennsylvania, Nov 1. What are these?
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