Philadelphia Reflections

Heron Rookery on the Delaware

Great Blue Heron

When the white man came to what is now Philadelphia, he found a swampy river region teeming with wildlife. That's very favorable for new settlers, of course, because hunting and fishing keep the settlers alive while they chop down trees, dig up stumps, and ultimately plow the land for crops. As everyone can plainly see, however, the development of cities eventually covers over the land with paving materials; it becomes difficult to imagine the place with wildlife. But the rivers and topography are still there. If you trouble to look around, there remain patches of the original wilderness, with quite a bit of wildlife ignoring the human invasion.

Heron Nests

Such a spot is just north of the Betsy Ross Bridge, where some ancient convulsion split the land on both sides of the Delaware River; the mouth of the Pennypack Creek on the Pennsylvania side faces the mouth of the Rancocas Cree on Jersey side. In New Jersey, that sort of stream is pronounced "crick" by old-timers, who are fast becoming submerged in a sea of newcomers who don't know how to pronounce things. The Rancocas was the natural transportation route for early settlers, but it now seems a little astounding that the far inland town of Mt. Holly was once a major ship-building center. The wide creek soon splits into a North Branch and a South Branch, both draining very large areas of flat southern New Jersey and making possible an extensive network of Quaker towns in the wilderness, most of whose residents could sail from their backyards and eventually get to Europe if they wanted to. In time, the banks of the Rancocas became extensive farmland, with large flocks of farm animals grazing and providing fertilizer for the fields. Today, the bacterial count of Delaware is largely governed by the runoff from fertilized farms into the Rancocas, rising even higher as warm weather approaches, and attracting large schools of fish. My barber tends to take a few weeks off every spring, bringing back tales of big fish around the place where the Pennypack and Rancocas Creeks join Delaware, but above the refineries at the mouth of the Schuylkill The spinning blades of the Salem Power Plant further downstream further thin them out appreciably.

Well, birds like to eat fish, too. For reasons having to do with insects, fish like to feed at dawn and dusk, so the bottom line is you have to get up early to be a bird-watcher. Marina operators have chosen the mouth of the Rancocas as a favorite place to moor boats, so lots and lots of recreational boaters park their cars at these marinas and go boating, pretty blissfully unaware of the Herons. Some of these boaters go fishing, but most of them just seem to sail around in circles.

As Seen From Amico Island

Blue herons are big, with seven-foot wingspreads as adults. Because they want to get their nests away from raccoons and other rodents, and more recently from teen-aged boys with 22-caliber guns, herons have learned to nest on the top of tall trees, but close to water full of fish. And so it comes about that there is a group of small islands in the estuary of the Rancocas, where the mixture of three streams causes the creek mud to be deposited in mud flats and mud islands. There is one little island, perhaps two or three acres in size, sheltered between the river bank and some larger mud islands, where several dozen families of Blue Herons have built their nests. One of the larger islands is called Amico, connected to the land by a causeway. If you look closely, you notice one group of adult herons constantly ferries nest building materials from one direction, while another group ferry food for the youngsters from some different source in another direction. At times, diving ducks (not all species of ducks dive for fish) go after the fish in the channel between islands, with the effect of driving the fish into shallow water. The long-legged herons stand in the shallow water and get 'em; visitors all ask the same futile question -- what's in this for the ducks? The heron island is far enough away from places to observe it, that in mid-March its bare trees look to be covered with black blobs. Some of those blobs turn out to be heroes, and some are heron nests, but you need binoculars to tell. When the silhouetted birds move around, you can see the nests are really only big enough to hold the eggs; most of the big blobs are the birds, themselves. There are four or five benches scattered on neighboring dry land in the best places to watch the birds, but you can expect to get ankle-deep in the water a few times, and need to scramble up some sharp hills covered with brambles, in order to get to the benches. In fact, you can wander around the woods for an hour or more if you don't know where to look for the heron rookery. Look for the benches, or better still, go to the posted map near the park entrance south of the end of Norman Avenue. There are a couple of kiosks at that point, otherwise known as portable privies. Strangers who meet on the benches share the information supplied by the naturalists that herons have a social hierarchy, with the most important herons taking the highest perches in the trees. That led to visitors naming the topmost herons "Obama birds", and the die-hard Republicans on the benches responding that the term must refer to dropping droppings on everybody else. That's irreverent Americans for you.

There is quite a good bakery and coffee shop just north on St. Mihiel Street (River Road), and the new diesel River Line railroad tootles past pretty frequently. That's the modern version of the old Amboy and Camden RR, the oldest railroad in the country. It now serves a large group of Philadelphia to New York commuters, zipping past an interesting sight they probably never realized is there because they are too busy playing Hearts (Contract Bridge requires four players, Hearts are more flexible). However, there's one big secret.

The birds are really only visible in the Spring until the trees leaf out and conceal them. Since spring floods make the mud islands impassible until about the time daylight savings time appears, there remains only about a two-week window of time to see the rookery, each year. But it is really, really worth the trouble, which includes getting up when it is still dark and lugging heavy cameras and optics. Dr. Samuel Johnson once remarked that while many things are worth seeing, very few are worth going to see. This is worth going to see.

And by the way, the promontory on the other side of the Rancocas is called Hawk Island. After a little research, that's very likely worth going to see, too.

Originally published: Thursday, March 18, 2010; most-recently modified: Wednesday, August 07, 2019