Great Blue Herons and People: Conflict, Protection, and Partnership

From target to protected icon

In the 19th century, herons and egrets were slaughtered for the millinery trade — by one 1886 estimate, 50 North American bird species were being killed for feathers, and blue herons were among the targets.¹² The backlash created modern bird conservation: Boston socialites Harriet Hemenway and Minna Hall organized a boycott of feathered hats in 1896, recruiting 900 women and founding the Massachusetts Audubon Society — the seed of the National Audubon Society.² Their campaign drove the Lacey Act (1900), the Audubon Model Law (1901), the Weeks-McLean Act (1913), and finally the Migratory Bird Treaty Act of 1918, which ended the plume trade and still protects Great Blue Herons today: it is illegal to capture, harm, or possess the birds, their nests, or their eggs.²³

The fish-pond conflict

The most common modern friction is backyard and commercial fish. A heron can eat about 13 ounces of fish a day — three 6-inch koi or ten 2-inch goldfish — and doubles that while feeding chicks, so an ornamental pond is an irresistible buffet.⁴ Humane, effective deterrents:

• Give fish hiding places — a length of drain pipe on the pond bottom works.⁵
• Overhead barriers — grid netting or crisscrossed silver mylar tape on 18-inch stakes, twisted to flash in the breeze.⁴⁶
• Dogs and motion-activated deterrents at aquaculture facilities.⁷
• Hazing — repeatedly walking out and shouting; most herons get the message.⁶

Context worth sharing: at fish hatcheries, one study found herons took mostly diseased fish that would have died shortly anyway — the sick fish lingered near the surface where herons could catch them.⁸ And remember the legal frame: because of the MBTA, any active management of herons requires consulting wildlife authorities first.⁷

Herons as neighbors and city birds

Herons habituate remarkably well to settled landscapes: they fish drainage ditches and golf-course ponds, and urban colonies thrive in Vancouver's Stanley Park (nesting since 1921) and beside Seattle's Ballard Locks.⁹¹⁰ Seattle went furthest — on March 17, 2003, the City Council designated the Great Blue Heron the official city bird (Resolution 30586), citing its power to raise public awareness of wildlife habitat.¹¹ Grassroots stewardship followed: Heron Habitat Helpers, founded in 2001, won Seattle's first Wildlife Sanctuary designation for Kiwanis Ravine and secured nest-protection rules and $600,000 in restoration funding.¹⁰

Herons as scientific partners

• Sentinel species: Environment and Climate Change Canada harvests heron eggs from St. Lawrence colonies every five years to track mercury, PCBs, DDE, and PBDEs — the heron is the official bioindicator of the river's health.¹²
• Ecosystem services: as apex predators they keep fish and small-animal populations in check and move nutrients; as colony nesters they fertilize rookery woodlands.¹³
• Public science: the Cornell Lab's Sapsucker Woods nest cam (live since 2012) has drawn millions of viewer-hours and thousands of schoolchildren into heron biology.¹⁴
• Community monitoring: programs like Audubon Florida's Colony Watch, Venice Rookery Watch (data since 1997), Stanley Park's Adopt-a-Nest, and Maine's Heron Observation Network let the public directly support science.¹⁵¹⁶

Living alongside herons: quick guidance