World’s largest congregation of eagles begins in B.C.

The world’s largest congregation of bald eagles happens on the river in the little community of Harrison Mills

World’s largest congregation of eagles begins in B.C.

Along the Harrison River in B.C.’s Fraser Valley, thousands of eagles are gathering to gorge on salmon that have reached the spawning ground.

David Hancock, a biologist who has been studying eagles for about 65 years, says the world’s largest congregation of bald eagles happens on the river in the little community of Harrison Mills, about 100 kilometres east of Vancouver.

“Last Saturday morning I did a survey off the river and there were just over 7,000 eagles in the area,” he said in a recent interview. “This is the most we’ve ever had in November.”

About 35,000 eagles gather in the lower Fraser Valley between November and February, and some days about 2,000 to 3,000 raptors move in, Hancock said.

“It’s the biggest single accumulating area because the Harrison River is the single most productive river,” said Hancock. “It’s the only river in Canada called a salmon stronghold river.”

The Harrison River is a tributary of the Fraser River and runs about 18 kilometres in length.

READ MORE: Fraser Valley Bald Eagle Festival explodes in popularity, draws thousands to Mission, Harrison Mills

READ MORE: Record-breaking bald eagle numbers predicted in Harrison Mills this fall

As rivers in Yukon, Alaska and northern British Columbia ice up food supplies freeze too, which forces the eagles south.

“Our salmon are just beginning to die so the table is set down here,” said Hancock.

But there are other factors that contribute to the number of eagles that descend on the area.

“Sometimes the north doesn’t freeze up and the eagles don’t need to come,” he added. “Some years we don’t get as many salmon so the table isn’t as generously set.”

The eagles remain in the area until February although a few thousand may fly further south into Washington, Oregon and California as winter deepens.

Hancock said this year, the Harrison River does not have enough salmon.

“This was not a good year for spawning,” he said.

When the salmon carcasses are gone, he said the eagles feed on spawned herring and oolachin, a smelt.

In about four years the area might not see as many eagles because overharvesting means there won’t be as many salmon carcasses for them to feed on, he said.

Hancock said in the last two decades researchers have learned about the connection between the huge trees in forests in the area and spawned salmon. The carcasses of spawned salmon give nutrition to the soil, he added, which helps trees grow.

“Without those salmon there are no big forests,” Hancock said. “That’s the lesson we learned in the last 20 years of ecology.”

The Canadian Press

Like us on Facebook and follow us on Twitter.

Just Posted

A tenant walks in front of her home on Boundary Road on Friday, June 18, 2021 after it was destroyed by fire the night before in Chilliwack. (Jenna Hauck/ Chilliwack Progress)
Chilliwack family homeless after fire rips through house on Abbotsford border

Turtle rescued, no one seriously hurt following Boundary Road fire in Chilliwack

Wild rabbits are all over Chilliwack, but people often think they’re someone’s lost pet and try to ‘save’ them. But the owner of Chilliwack’s Reptile Room says good intentions can have bad consequences for wild animals. (Photo by THE CANADIAN PRESS)
Owner of Chilliwack’s Reptile Room asks people to leave wild animals in the wild

Amber Quiring says people who think they’re helping are actually doing more harm than good

Brandon Hobbs (turquoise shirt), brother of missing Abbotsford man Adam Hobbs, gathers with other family and friends to distribute posters in Chilliwack on Thursday, June 17, 2021. (Jenna Hauck/ Chilliwack Progress)
Search efforts expand to Chilliwack and beyond for missing Abbotsford man

Family, friends put up posters in Chilliwack, Agassiz, Hope for missing 22-year-old Adam Hobbs

A CH-149 Cormorant from 442 Transport and Rescue Squadron out of CFB Comox on a training exercise in Chilliwack on June 16, 2021. (William Snow photo)
VIDEO: Military search and rescue training in Chilliwack Wednesday

CH-149 Cormorant and CC-115 Buffalo from CFB Comox participated in downed aircraft rescue simulation

Stock photo by LEEROY Agency from Pixabay
Drop-in vaccination clinics slated in Abbotsford for construction workers

Among three sites in Lower Mainland holding no-appointment clinics in June and July

People line up to get their COVID-19 vaccine at a vaccination centre, Thursday, June 10, 2021 in Montreal. THE CANADIAN PRESS/Ryan Remiorz
Vaccines, low COVID case counts increase Father’s Day hope, but risk is still there

Expert says people will have to do their own risk calculus before popping in on Papa

John Furlong told the Vancouver Board of Trade on Feb. 20, 2020 that he thinks the city could and should bid for the 2030 Winter Games. (CP photo)
PODCAST: John Furlong lays out a ‘provincial’ plan to host the 2030 Winter Olympics

Podcast: Chat includes potential role for Vancouver Island communities

The pilot of this single-engine propeller plane was unhurt after crash-landing in a Como Road orchard Friday, June 18. Photo: Laurie Tritschler
Plane crash lands into Grand Forks orchard, pilot injured

RCMP have secured the crash site, pending investigation by Transport Canada

BC Ferries’ newest Island Class vessel is experiencing an issue with one of its thrusters off the Algerian coast. Photo courtesy patbaywebcam.com.
BC Ferries newest vessel having mechanical issues in Mediterranean

Island 4 will be repaired in Spain before crossing Atlantic

Thousands of protesters make their way through the downtown core during a Black Lives Matter protest in Ottawa, Friday June 5, 2020. THE CANADIAN PRESS/Adrian Wyld
MPs’ study of systemic racism in policing concludes RCMP needs new model

Chair of the House public safety committee says it’s time for a reckoning on ‘quasi-military’ structure

A case filled with packages of boneless chicken breasts is shown in a grocery store Sunday, May 10, 2020, in southeast Denver. THE CANADIAN PRESS/AP-David Zalubowski
One million chickens euthanized during labour dispute at Quebec slaughterhouse

Premier says waste amounts to 13 per cent of the province’s chicken production thrown in the garbage

Premier of Manitoba Brian Pallister speaks at a news conference at the Manitoba Legislative Building in Winnipeg on Wednesday, April 7, 2021. THE CANADIAN PRESS/David Lipnowski
Provincial leaders want more federal money for health care, plan to meet in fall

Premiers ask Ottawa to increase its share of overall health spending to 35 per cent from 22 per cent

A section of the eastern slopes of the Canadian Rockies is seen west of Cochrane, Alta., Thursday, June 17, 2021. A joint federal-provincial review has denied an application for an open-pit coal mine in Alberta’s Rocky Mountains, saying its impacts on the environment and Indigenous rights aren’t worth the economic benefits it would bring. THE CANADIAN PRESS/Jeff McIntosh
Panel says Grassy Mountain coal mine in Alberta Rockies not in public interest

Public hearings on the project in southern Alberta’s Crowsnest Pass region were held last fall

Most Read