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| Today I watched parents feeding nestling tree swallows at the two locations I monitor in Burlington County, New Jersey. |
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| At both sites, a nestling sat in the doorway. Click to enlarge. |
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| When a parent approached, the nestling opened its brightly colored gape. It attracts the parent's attention and helps them deliver food. |
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| Success. |
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| Still hungry. |
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| Still hungry. |
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