Information sign by the entrance to the <a href="https://en.wikipedia.org/wiki/John_Heinz_National_Wildlife_Refuge_at_Tinicum" class="extiw" title="w:John Heinz National Wildlife Refuge at Tinicum">John Heinz National Wildlife Refuge at Tinicum</a>. America's First Urban Refuge.
<a href="//commons.wikimedia.org/wiki/User:Zeete" title="User:Zeete">Zeete</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>