Birdwatching tours run at John Heinz Refuge next to Philadelphia Airport

The John Heinz National Wildlife Refuge in Tinicum, a 12,000‑acre tidal marsh estuary bordering Darby Creek, is adjacent to Philadelphia International Airport.

Interpretive guide John Lemonick has led three‑hour bird walks for the past six months, taking groups of five to fifteen birders on Saturday mornings twice each month from 8 a.m. to 11 a.m.; the two‑hour guided portion follows trails and boardwalks and includes identification of species such as northern harriers, common yellowthroats, mallard ducks, sandpipers, red‑winged blackbirds, great crested flycatchers, chimney swifts, northern flickers, red‑bellied woodpeckers, tree swallows, robins, American crows and others, as well as calls of red‑bellied woodpeckers, Carolina wrens, cardinals, blue jays, catbirds and crows.