Pied-billed Grebe – LIFE IN THE LOWER SUSQUEHANNA RIVER WATERSHED

April 26, 2023

Photo of the Day

The Pied-billed Grebe is an elusive visitor to local ponds and lakes during migration. Like a submarine, it can sink out of sight to avoid detection.

November 4, 2021August 14, 2023

A Visit to Bombay Hook National Wildlife Refuge

It’s surprising how many millions of people travel the busy coastal routes of Delaware each year to leave the traffic congestion and hectic life of the northeast corridor behind to visit congested hectic shore towns like Rehobeth Beach, Bethany Beach, and Ocean City, Maryland. They call it a vacation, or a holiday, or a weekend, and it’s exhausting. What’s amazing is how many of them drive right by a breathtaking national treasure located along Delaware Bay just east of the city of Dover—and never know it. A short detour on your route will take you there. It’s Bombay Hook National Wildlife Refuge, a quiet but spectacular place that draws few crowds of tourists, but lots of birds and other wildlife.

Bombay Hook National Wildlife Refuge is located just off Route 9, a lightly-traveled coastal road east of Dover, Delaware. Note the Big Bluestem and other warm season grasses in the background. Bombay Hook, like other refuges in the system, is managed for the benefit of the wildlife that relies upon it to survive. Within recent years, most of the mowed grass and tilled ground that once occurred here has been replaced by prairie grasses or successional growth, much to the delight of Northern Bobwhite (Colinus virginianus) and other species.

Let’s join Uncle Tyler Dyer and have a look around Bombay Hook. He’s got his duck stamp and he’s ready to go.

Uncle Ty’s current United States Fish and Wildlife Service Duck Stamp displayed on his dashboard is free admission to the tour road at Bombay Hook and other National Wildlife Refuges.

The refuge at Bombay Hook includes woodlands, grasslands, and man-made freshwater pools, but it is predominately a protectorate of thousands of acres of tidal salt marsh bordering and purifying the waters of Delaware Bay. These marshes are renowned wintering areas for an Atlantic population of Snow Goose known as the “Greater Snow Goose” (Anser caerulescens atlanticus). Witnessing thousands of these birds rising over the marsh and glowing in the amber light of a setting sun is an unforgettable experience.

Trails at various stops along the auto tour route lead to observation towers and other features. This boardwalk meanders into the salt marsh grasses and includes a viewing area alongside a tidal creek. Our visit coincided with a very high tide induced by east winds and a new moon.

During high tide, an Eastern Cottontail (Sylvilagus floridanus) seeks higher ground near the boardwalk and the wooded edge of the salt marsh.

As the tide rises, fast-flying shorebirds scramble from flooded mudflats in the salt marsh on the east side of the tour road.

When high tide arrives in the salt marshes, shorebirds and waterfowl often concentrate in the man-made freshwater pools on the west side of the tour road. Glaring afternoon sun is not the best for viewing birds located west of the road. For ideal light conditions, time your visit for a day when high tide occurs in the morning and recedes to low tide in the afternoon.

A view looking west into Shearness Pool, largest of the freshwater impoundments at Bombay Hook.

Bombay Hook has many secretive birds hiding in its wetlands, but they can often be located by the patient observer. Here, two Pied-billed Grebes feed in an opening among the vegetation in a freshwater pool.

One of Bombay Hook’s resident Bald Eagles patrols the wetlands.

American Avocets (Recurvirostra americana) gather by the hundreds at Bombay Hook during the fall. A passing eagle will stir them into flight.

An American Avocet, a delicate wader with a peculiar upturned bill.

As soon as the tide begins receding, shorebirds and waterfowl like these Green-winged Teal begin dispersing into the salt marshes to feed on the exposed mudflats.

The woodlands and forested areas of the refuge host resident songbirds and can be attractive to migrating species like this Yellow-rumped Warbler.

For much of its course, the tour road at Bombay Hook is located atop the dike that creates the man-made freshwater pools on the western edge of the tidal salt marsh. If you drive slowly and make frequent stops to look and listen, you’ll notice an abundance of birds and other wildlife living along this border between two habitats. Here, a Swamp Sparrow has a look around.

Savannah Sparrows are common along the tour road where native grasses grow wild.

Bombay Hook is renowned for its rarities. One of the attractions during the late summer and autumn of 2021 was a group of Roseate Spoonbills (Platalea ajaja), vagrants from the southern states, seen here with Great Egrets and Snowy Egrets (Egretta thula).

Roseate Spoonbills and Great Egrets at Bombay Hook.

Remember to go the Post Office and get your duck stamp. You’ll be supporting habitat acquisition and improvements for the wildlife we cherish. And if you get the chance, visit a National Wildlife Refuge. November can be a great time to go, it’s bug-free! Just take along your warmest clothing and plan to spend the day. You won’t regret it.

March 29, 2020March 30, 2020

The Fallout Continues

Fog and mist lingered throughout the day, as did the migratory water birds on the river and lakes in the lower Susquehanna valley. As a continuation of yesterday’s post on the fallout, here’s a photo tour of some of the sites where ducks, loons, grebes, and other birds have gathered.

American Robins may have comprised a large portion of the northbound flight appearing on last evening’s radar images. Today, hundreds could be seen on soggy lawns where earthworms might be found near the surface. This flock was finding sustenance at Highspire’s Reservoir Park in Dauphin County.

This drake Gadwall (Mareca strepera) and two hens had dropped in for a visit at the Highspire Reservoir Park.

Hundreds of Buffleheads were on the fogged-in Susquehanna River at Harrisburg this afternoon. From Front Street and Maclay Street in front of the Pennsylvania Governor’s Mansion, they seemed to be everywhere in sight on the rain-swollen current. After passing downstream, flocks flew in a straight line formation just above the water’s surface as they made a short trip back up the river to then drift down through the channels once again.

A portion of a raft consisting of about three dozen Red-breasted Mergansers floats by the Pennsylvania Governor’s Mansion. Several of the hundred or more Scaup on the river intermingled with these mergansers from time to time.

A lone Long-tailed Duck (Clanqula hyemalis) near the aforementioned raft of mergansers. The Long-tailed Duck was formerly known as the Oldsquaw in North America. The common name used in Britain and Europe is now preferred.

Two of at least a hundred Horned Grebes (Podiceps auritus) seen in the Susquehanna at Harrisburg this afternoon.

American Coots (Fulica americana) at Memorial Lake State Park in Lebanon County.

One more Common Loon than yesterday at Memorial Lake.

A mixed raft of diving ducks and grebes at Memorial Lake.

A closeup of the same raft reveals Buffleheads, Scaup, Ring-necked Ducks, Ruddy Ducks (Oxyura jamaicensis), a Pied-billed Grebe, and Horned Grebes.

Stormy weather certainly is a birder’s delight.

March 28, 2020March 30, 2020

Fallout in the Lower Susquehanna River Watershed

Local birders enjoy going to the Atlantic coast of New Jersey and Delmarva in the winter. The towns and beaches host far fewer people than birds, and many of the species seen are unlikely to be found anywhere else in the region. Unusual rarities add to the excitement.

The regular seaside attraction in winter is the variety of diving ducks and similar water birds that feed in the ocean surf and in the saltwater bays. Most of these birds breed in Canada and many stealthily cross over the landmass of the northeastern United States during their migrations. If an inland birder wants to see these coastal specialties, a trip to the shore in winter or a much longer journey to Canada in the summer is normally necessary—unless there is a fallout.

Migrating birds can show up in strange places when a storm interrupts their flight. Forest songbirds like thrushes and warblers frequently take temporary refuge in a wooded backyard or even in a city park when forced down by inclement weather. Loons have been found in shopping center parking lots after mistaking the wet asphalt for a lake. Fortunately though, loons, ducks, and other water birds usually find suitable ponds, lakes, and rivers as places of refuge when forced down. For inland birders, a fallout like this can provide an opportunity to observe these coastal species close to home.

Not so coincidentally, it has rained throughout much of today in the Lower Susquehanna River Watershed, apparently interrupting a large movement of migrating birds. There is, at the time of this writing, a significant fallout of coastal water birds here. Hundreds of diving ducks and other benthic feeders are on the Susquehanna River and on some of the clearer lakes and ponds in the region. They can be expected to remain until the storm passes and visibility improves—then they’ll promptly commence their exodus.

The following photographs were taken during today’s late afternoon thundershower at Memorial Lake State Park at Fort Indiantown Gap, Lebanon County.