Pittsburghers preserving pawpaw trees, some hope it will lead to more zebra swallowtail butterflies

The deciduous tree bears North America’s largest native fruit, and, as Marsden explained, supports the zebra swallowtail butterfly — a species that has all but disappeared from the Pittsburgh region. “They don’t exist here, really,” Marsden said as she trekked along the river. The closest she’s fou...

Redirecting to full article...