| From DVOC's Delaware Valley Birds: "Fresh water lakes and rivers. Nests commonly along large rivers and streams in the mountains. Rapidly spreading south along major rivers. Freeze limited. Casual in summer away from breeding areas." |  © A & J Binns |
| From DVOC's Delaware Valley Birds: "Fresh water lakes and rivers. Nests commonly along large rivers and streams in the mountains. Rapidly spreading south along major rivers. Freeze limited. Casual in summer away from breeding areas." | © A & J Binns |