Banding and re-sighting birds is such a rewarding experience. You never know where and when a bird that you banded will show up and what you will learn from that encounter. Banding is a method for biologists to track migratory birds and gain valuable information about them through band re-sightings or encounters. Each year, around 10-20% of young ospreys that are documented during nest surveys in New Jersey are banded with USGS bird bands for future tracking. On Barnegat Bay, through Project RedBand, young ospreys are also banded with red auxiliary, or “field readable” bands. Since 2014, over 600 red bands have been deployed and in recent years we have had more re-sightings of birds that are alive as opposed to those that were found dead. In 2024, we identified 30 ospreys in New Jersey by their red bands.
In a landmark decision, the bald eagle and osprey have been removed from New Jersey’s endangered species list. This remarkable achievement is the result of decades of dedicated conservation efforts and collaboration between government agencies, environmental organizations like Conserve Wildlife Foundation, and the public. The recovery of these iconic birds demonstrates the power of focused conservation initiatives and habitat protection.
The bald eagle, once on the brink of extinction due to DDT use and habitat loss, has made an incredible comeback in New Jersey. From a single nesting pair in the 1970s, the state now boasts 293 nesting pairs. Similarly, ospreys have rebounded from just 50 nests in the 1970s to more than 800 today.
These success stories highlight the effectiveness of long-term conservation strategies, including habitat restoration, nest protection, and public education. They serve as inspiration for future conservation efforts and remind us of the positive impact we can have when we work together to protect our natural heritage.
by Larissa Smith Senior Wildlife Biologist Posted on
December 15th, 2024 Clinton pair@ Linda Rapacki
It’s a good time of year to see bald eagles in New Jersey. Many of New Jersey’s resident pairs are back at their nests, getting them ready for the 2025 nesting season. Though the majority of pairs won’t start incubating until February, there are always a few “early bird” pairs that start laying eggs in January.
In addition to the nesting pairs there are immature eagles (those that aren’t yet five years of age and sexually mature) and wintering eagles that come to New Jersey from areas where it’s much colder and the water has frozen. A good spot to find eagles is around water supplies that aren’t frozen solid such as rivers and the Delaware Bay. Here are some photos taken by NJ Eagle Project volunteers in November and December of 2024.
I never imagined the rewarding experience of observing adult ospreys that I banded as nestlings. Over the past decade, I have banded six hundred and twelve ospreys with field readable red auxiliary bands. These birds originated from nests throughout the Barnegat Bay watershed, from Point Pleasant to Little Egg Harbor. This year, 29 red banded ospreys were re-sighted along the coast of New Jersey.
Wildlife telemetry is a growing technological tool that uses tracking devices to help answer questions about animal movement patterns. For highly mobile and migratory species like shorebirds, telemetry is especially useful because it offers an opportunity to model migration routes, identify important staging or foraging sites, and learn about bird behavior. Since beginning a comprehensive American oystercatcher monitoring and banding program on the Delaware Bay in 2022, CWF and our partners have set out to learn as much as we can how oystercatchers move around the Bayshore and beyond so that we can apply this knowledge to management decisions. By banding oystercatcher adults and chicks over the last two seasons, we have been able to gain a basic understanding of oystercatcher movements around the Bayshore as well as some of their staging and wintering locations. However, there is only so much we can learn through band resights alone. For that reason, we were very excited to partner with The Wetlands Institute (TWI), Cape May Point Science Center (CMPSC), and Cellular Tracking Technologies (CTT) this past season to pioneer telemetry research for oystercatchers on the Bay.
Step 1: Choosing a Telemetry Method
Generally, wildlife telemetry can be divided into two camps: radio and GPS. Radio-tags work by emitting radio frequencies that are detected by radio towers or hand-held receiver devices when the tagged animal is within the detection range. Each transmitter emits a unique signal which allows the biologists to identify individuals. One big limitation of radio telemetry is that tags will only ping when in range of a radio tower (e.g., Motus towers) or handheld receiver, which means it relies on a widespread network of radio towers and/or biologists collecting data in the field. GPS telemetry, on the other hand, works by using satellite signals to pinpoint an individual’s exact location in real-time, similar to the way your cell phone locates your location on a navigation app. The units can store location data and then transfer information wirelessly through cellular networks right to an online portal on a phone or computer. Since this type of tracking does not require local radio towers, it can collect location data anywhere and at any time, which allows biologists to track both fine-scale and large-scale movement patterns. However, GPS transmitters are typically much heavier and more expensive than their radio-tag counterparts, which means this type of telemetry is limited by focal species and budget. While both methods have their advantages, we consulted with CTT to choose GPS units for our oystercatchers, and CMPSC generously provided the funding to purchase five transmitters for the Delaware Bay Oystercatcher project.
Overview of GPS telemetry: A tracking device is deployed onto the focal animal. The tracking device communicates with satellites at designated time intervals to calculate precise latitude and longitude positions. Location information is stored on the tracking device until it can be transmitted remotely through cellular networks to an online portal that can be accessed via phone or computer.
Step 2: Deploying the Transmitters
Once we chose the transmitter type, we had to design an attachment method. To our knowledge this is the first time GPS units have been deployed on oystercatchers in New Jersey, so we relied on the expertise of our colleagues working with oystercatchers in other states as well as CTT’s experts. In the end, we decided to use a “leg-loop harness” design based on recommendations from the American Oystercatcher Working Group. This method involves equipping the bird with a custom harness that fits close to its body, around its legs. The transmitter unit rests on the bird’s back so that the solar panels that power the battery are exposed to the sun. Fitting the harness is very precise work, and extra care is taken to make sure the harness is balanced and appropriately snug. Once deployed, the harness remains attached to the bird for the remainder of its life, although every effort is made to recapture the birds and remove transmitters that no longer function.
Oystercatchers are relatively large shorebirds, but we were not prepared for how challenging it was to find heavy birds on the Delaware Bay!
As you may expect, transmitter weight is a limiting factor when it comes to deploying units on lightweight animals like birds. The last thing we want to do is negatively impact the bird’s health and ability to fly. To prevent negative impacts to the birds, the combined weight of the harness and transmitter must not exceed 3% of the oystercatcher’s body weight. Since our set-ups were on the heavier side, averaging around 12-13 grams, we had to find oystercatchers heavy enough to carry them. Oystercatchers are relatively large shorebirds, but we were not prepared for how challenging it was to find heavy birds on the Delaware Bay! We captured around ten adults during the 2024 season, but only two birds met the mass criteria and were able to safely carry tracking units.
TWI’s Lisa Ferguson carefully fitting the leg loop harness on Roy Royster, an adult male oystercatcher. The harness is inspected for balance, placement, and tightness before being cut to size and stitched up for extra support. The transmitter unit (black rectangle) rests on the oystercatcher’s back so that its solar panels can be exposed to the sunlight. After deployment, the bird’s behavior and flight are monitored to ensure the bird is comfortable and unaffected by its new accessory.
Step 3: Tracking the Birds!
Given our challenges with deployment this season, we were very happy to successfully tag and track two birds, an adult female named Snowflower and an adult male named Roy Royster. Each bird has their own unique story representing different aspects of “oystercatcher life” during the nesting season and beyond. Although we are still in the early stages of collecting and analyzing transmitter data, we are excited to share some snapshots of their movements and behavior so far.
Snowflower:
Snowflower was tagged on May 7, 2024 at South Goshen Beach, while tending an active nest with her mate King Nummy. Unfortunately, the pair lost their nest to fox predation nine days later on May 16th, but we were still able to collect some interesting movement data before and after the nest was lost. While incubating the active nest, Snowflower stayed close to her nest territory, with occasional foraging trips to the oyster beds/living shorelines at Bay Cove Beach (Map 1). Following her nest loss, Snowflower’s range expanded significantly to encompass much more of the Bayshore, spanning from Del Haven all the way up to Egg Island – a distance of 15 to 23 miles depending on possible flight routes (Map 2)!We were also interested to observe that she continued to make foraging trips to living shorelines/oyster beds at Bay Cove and Rutger’s Cape Shore Laboratory. Up until very recently, Snowflower has remained on the Cape May Peninsula, especially around Atlantic Coast sites such as Stone Harbor Point, a known oystercatcher staging and wintering roost location (Map 3). However, she recently surprised us by taking a brief “vacation” all the way down to the Eastern Shore of Virginia from October 10-12, only to return to New Jersey on the 13th (Map 3)! It remains to be seen whether she will stay in New Jersey year-round or head to a more southern winter location.
Living shoreline oyster beds at Bay Cove Beach visited by Snowflower. Telemetry data, combined with field-based observations, can help us assess the value of such foraging habitats to oystercatchers.
Map 1: Snowflower stayed close to her nest territory at Goshen Beach while her nest was active. May 7 – May 16, 2024
Map 2: Following her nest loss, Snowflower expanded her range to include a large portion of Bayshore beaches including regular foraging trips to oyster beds in the region. May 16 – July 23, 2024.
Map 3: Snowflower’s staging locations after the nesting season. September 1-October 14, 2024. In addition to Delaware Bay sites, she is utilizing Atlantic Coast beaches and marshes known to host staging and wintering roots of oystercatchers. In a surprise trip, Snowflower flew down to the Eastern Shore of Virginia from October 10-12, but returned to the Stone Harbor/North Wildwood area on October 13th.
Roy Royster:
Compared to Snowflower’s transmitter deployment, Roy Royster’s story is filled with lots of ups and downs. After trying and failing to find oystercatchers heavy enough to carry transmitters, we were so ecstatic to finally deploy our second transmitter on Roy on June 28th near Dyers Cove in Cumberland County. This was especially exciting for the team because Roy had successfully hatched a nest and was in the process of brooding his chick (Rudy Royster) with mate Rhonda. Oystercatcher chicks depend on food provisions from their parents until they are at least 60 days old when their beaks become strong enough to pry open bivalves, their primary food source. Large feeding areas close to nesting locations have been linked to increased fledgling success (Nol 1989), presumably because adults foraging closer to their offspring can devote more time and energy to chick care and protection. Since only three nests managed to hatch during the 2024 season, we felt very lucky to be able to collect GPS data on a brooding pair to help test that hypothesis.
Unfortunately, Roy’s transmitter went silent almost immediately after deployment and didn’t transmit a single location after June 28th. We knew Roy was still alive and well based on field observations, but we couldn’t figure out why his transmitter wouldn’t work. After we had just about given up on receiving any data we were shocked when Roy’s transmitter finally checked in on September 11th, all the way from the Eastern Shore of Virginia! The transmitter also dumped hundreds of GPS locations stored before Roy left New Jersey, so we were able to map out some of his foraging patterns while brooding Rudy and after Rudy had fledged. While we don’t have fine-scale timing intervals, it seems like Roy stayed close to his brooding territory at South Dyers Cove (Map 4), potentially indicating the presence of abundant and high quality foraging resources. After Rudy fledged and was able to fly, Roy expanded his range, making trips to Money Island and Egg Island (Map 5). Roy’s migration data does have some gaps, so we can’t determine the exact route and timing of his migration south, but he continues to check in from Virginia (Map 6), coincidentally just a few miles from this year’s American Oystercatcher Working Group Meeting in Wachapreague. Sounds like the perfect opportunity for a field trip this December!
Map 4: Roy Royster remained close to his brooding territory while provisioning his chick. June 28-July 16, 2024.
Map 5: After Roy’s chick had fledged (July 16) and could forage more independently, Roy expanded his range to include further sites including Money Island and Egg Island. August 1-August 27, 2024
Map 6: In the fall, Roy Royster relocated to the Eastern Shore of Virginia, near Wachapreague. August 28-Sept 30, 2024.
Next Steps
We look forward to continued tracking and monitoring of Roy Royster and Snowflower throughout the winter and the next nesting season, but Roy and Snowflower represent just the beginning of our telemetry efforts on the Delaware Bay. We are already troubleshooting challenges encountered during our first season, and we are excited to improve and expand oystercatcher tracking in the years to come. Make sure to stay tuned for future updates on this exciting addition to our Delaware Bay American Oystercatcher project.
An active osprey nest with two live and one dead nestling on the Mullica River. June 2024.
As juvenile ospreys fledge and adult females begin their southbound migration, work to summarize data from this year is ongoing. So far, it doesn’t look like a terrible year but not a great one either. Food stress (or brood reduction) was still apparent within some coastal nest colonies, despite the lack of severe weather (nor’easters/microbursts, etc) which could affect the ability of adult males to find and catch prey.
So far it has been an usual year for nesting osprey in New Jersey. This spring, the pair that has nested at our osprey cam in Barnegat Light, who arrived on time, the female did not lay any eggs. Then I heard from a woman who watches a nest near the southern end of Long Beach Island who reported the same — pair present but incubation was never observed. Another report came in from an osprey nest watcher on the Mullica River (to the southwest of LBI) who reported the same — no incubation observed. We put out a call on social media for osprey nest watchers to report anything odd like this to us (while also reporting osprey nest activity online via Osprey-watch.org). Some people reported seeing the same behavior..
There aren’t many times when you get to climb to the roof of a courthouse in a major metropolitan area. Except if you’re a raptor biologist! We recently joined NJ Fish & Wildlife’s Chief of the Endangered and Nongame Species Program, Kathy Clark and Union County staff and guests to band the four young falcons produced at a nest atop the Union County Courthouse, home to the Union County Falcon Cam.
During the 2020 NJ Bald Eagle nesting season the Camden B pair hatched and raised two chicks. This nest was located along the Cooper River, in Camden County on a small parcel of undeveloped land in a very urban area.
Camden B eagle nest with 6 week old chicks May 14, 2020: photo by: Marilyn Henry
On June 5, we received notification that the nest had fallen from the tree during a storm, at that time the two chicks were approximately nine weeks old. They were too young to fly since eagle don’t fledge until at least 11 weeks of age. At nine weeks of age they are the size of an adult eagle so they would be noticeable on the ground. Despite an extensive search by staff and volunteers there were no signs of the two nestlings.
Fallen Camden B nest, June 8, 2020
Local wildlife rehab centers were notified in case the young eagles were found and brought in for care. At that point we could only speculate on their fate. Then on June 28, NJ Division of Fish & Wildlife Law Enforcement was alerted to eagles being held in a dog pen at a residence in Camden. NJDFW Conservation Officers visited the home and found the two missing eagle chicks. At this point the young eagles were twelve weeks old and should have fledged if they were still in the nest.
Camden eagles in dog pen; June 28th, 2020: photo K. Clark
The eagles had been kept in the basement and fed hotdogs and chicken. Fortunately for the chicks they were moved outside and an alert citizen reported the captive eagles. They were taken to Tri-State Bird Rescue & Research for evaluation and treatment. After a week in rehab it was determined that they were healthy enough to be released. By this time the adults were no longer actively in the area of the nest tree. After eagle chicks fledge they still spend a few weeks in the nest area with the adults, learning to survive on their own. It was decided to release the two eagles in a remote area of Cumberland County. On July 9 the two Camden eagles were released at the site.
E/96 & E/97 at release, Diving Creek Cumberland County
Staff and volunteers temporarily provided supplemental food (fish and road-killed mammals). The release area has a large population of juvenile and sub-adult eagles who could provide the social learning the young eagles needed. A trail camera was set up at the food drop. E/97 wasn’t seen again at the release site. Her sibling, E/96 was seen in the area several times after her release.
On March 18th, 2024, Kathy Clark with NJENSP received an email from Jerry amEnde regarding a green banded eagle he photographed at Bombay Hook NWR in Delaware.
The banded eagle was E/97! We are thrilled to know that despite her not having a “traditional” start to her life, she has to survived to become a gorgeous four year old eagle.
A surfer and osprey at the beach on Long Beach Island. July 2023.
In coastal New Jersey, during spring and summer the recovery of ospreys is apparent. They grace the skies of most ocean front beaches from Sandy Hook to Cape May in search of prey. Their nests line our shorelines and can be found in a variety of nest structures. Today there are over 800 pairs of ospreys who nest all across New Jersey. Results from the 2023 nesting season illustrate how the osprey population continues to grow but with reduced reproductive success due to extremes in weather and reduced prey availability.
