Second of three parts. Read the part one here. Zebra, giants and pipevines are the three uncommon swallowtail species in this area. They are not seen nearly as often as the eastern tiger, black or ...

On a wooded hillside along the banks of the Allegheny River, Gabrielle Marsden brushed up against an oblong leaf: Asimina triloba—the American pawpaw. The deciduous tree bears North America's largest ...

Pittsburghers Preserving Pawpaw Trees, Some Hope It Will Lead to More Zebra Swallowtail Butterflies On a wooded hillside along the banks of the Allegheny River, Gabrielle Marsden brushed up against an ...

A rare butterfly species — the zebra swallowtail — has been spotted in Toronto's High Park for the first time in over a century. The rare butterfly was spotted by Crystal Byrne, a butterfly enthusiast ...

On a wooded hillside along the banks of the Allegheny River, Gabrielle Marsden brushed up against an oblong leaf: Asimina triloba. The American pawpaw.The deciduous tree bears North America’s largest ...

On a wooded hillside along the banks of the Allegheny River, Gabrielle Marsden brushed up against an oblong leaf: Asimina triloba. The American pawpaw. The deciduous tree bears North America’s largest ...