Visiting Duke Farms
Visitor Information Visitor Services Property Highlights Activities Property Map Guidelines & FAQ For Educators Duke Farms App Updates Regarding COVID-19: Property Impacts
Classes & Events
Calendar Classes for Families Classes for Adults Professional Development Farm to Table Market Annual Festivals
Making an Impact
Habitat Restoration AgroEcology Sustainability Eagle Cam Stewardship at Home Distance Learning In the Classroom Community Garden
About
Staff Partners Volunteers Jobs and Internships
Blog
Volunteer
Contact
Privacy Policy
Newsletter
Duke Farms
Visiting Duke Farms Classes & Events Making an Impact About
< View All Blog Posts

Your Bald Eagle Questions Answered

4/8/2015 | Eagle Cam, In the Classroom Jim Wright

 Photo taken on Sunday via Eagle Cam screenshot. Kathy Clark by Ben WurstOur story thus far:  The Bald Eagles incubated two eggs this season. Both eaglets have  hatched. You can view the nest on streaming video here. Will the smaller eaglet get enough food? Are the parents different each year? Once the eaglets are fully grown, do they ever see their parents again? With so many pairs of eyes watching the Duke Farms, questions are sure to arise. For some authoritative answers to viewer questions, we turned to Kathy Clark, eagle expert and a wildlife biologist for the N.J. Endangered and Nongame Species Program. The questions are in italics, indented. Kathy's answers are in roman (the regular typeface).

I've noticed the parents seem to favor the stronger of the two eaglets and not feed the smaller as much. I've read there's a possibility they'll reject the weaker one. Is any human intervention is planned in that event ?

The observer is correct that eagles (and all birds with asynchronous hatching) will feed the oldest and strongest chick first, but that's not the same as "rejecting" a smaller chick. This is an evolutionary adaptation so that in times of scarce food, at least one chick might survive rather than none of them. When food is adequate, all chicks get fed as long as they continue their begging behaviors to the adults.

Are the two parents are "strangers" when they mate?  

Depends what you mean by "mate."  They spend time together, sometimes even more than one year, leading up to nesting. Both aduts were on the nest late FridayMany new pairs build a nest but don't lay eggs, when they are in their 4th year and not yet sexually mature. Courtship is an important aspect of their behavior leading up to nesting -- it builds the pair-bond and provides them "clues" as to their potential mate's suitability (ability to nest-build and bring in food). So by the time egg-laying time comes around, the birds do know each other.

Do the same parents return to the nest each year?

The same adults remain in their nest area year-round, and they add to their nest each winter prior to nesting. They are quite loyal to their nest site.

Once babies are grown and fly away, do the parents just say bye-bye and never meet again?

Eagle-D-95-with-transmitter_05062014 Transmitter being attached to a young eaglet. Eaglet is hooded to keep it calm. Photo courtesy of Conserve Wildlife Foundation.  

We don't really know.  We've had some visual observations of an adult following a fledgling when it makes some large movements away from the nest, which suggests they care for them until they're sure the young eagles are doing well. But after the young leave the nest area for good (I recommend checking out maps of satellite-tracked eagles like ours at http://www.conservewildlifenj.org/protecting/projects/baldeagle/), and later end up in their old nest area, we can assume they would know each other, but they no longer have that relationship. The tracked bird we named "Nacote" from 2014 has been all over southern NJ, and has been close to his old nest and other nests.  Adult birds will defend their nest area from all eagles in most instances. We've heard a report of a young eagle hanging around a nest with 2 adults and appearing to help the adults.... That's not the norm.


Got a question or suggestion? E-mail Jim at wrightjamesb@gmail.com

Jim Wright writes The Bird Watcher columnist for The Record and the Herald-News. He is the author of four coffee-table books about wild places, and the deputy marsh warden of the Celery Farm Natural Area in Allendale, N.J.

Events & Classes

View All

APR 14

Evening Birding at Duke Farms: Early Spring Migrants & Resident Breeding Birds

APR 14

Evening Birding at Duke Farms: Early Spring Migrants & Resident Breeding Birds

APR 14

Evening Birding at Duke Farms: Early Spring Migrants & Resident Breeding Birds

VIEW ALL

Contact

Duke Farms Foundation

1112 Dukes Parkway West Hillsborough, N.J. 08844

(908) 722-3700

info@dukefarms.org


Navigate

Visiting Duke Farms Classes & Events Making an Impact About
Blog Volunteer Contact Privacy Policy Newsletter