While they aren't especially beautiful trees, pawpaws are "hugely beneficial for their value to all kinds of wildlife and they're the host plant for the Zebra Swallowtail butterfly." They also provide ...

Black swallowtail butterfly. Photo by Dan Hemenway. Just as monarchs famously prefer milkweed for food and egg-laying, swallowtail butterflies also have a preferred food as caterpillars. They prefer ...