Species Profile
Great Blue Heron
Ardea herodias
Great Blue Heron
Quick Facts
Conservation
LCLeast ConcernLifespan
15–20 years
Length
91–137 cm
Weight
1820–2700 g
Wingspan
167–201 cm
Migration
Partial migrant
Also known as: Great Blue, Blue Crane, Blue Heron
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Appearance
The Great Blue Heron is a stately wading bird with predominantly blue-gray plumage, long legs, and an S-shaped neck. Its head is white with a black eyebrow stripe extending to a plume, and it has a long, dagger-like yellow bill.
Males and females look alike, although males are typically larger than females. Males also develop elongated plumes on their heads, necks, and backs during the breeding season. Juveniles are duller with a darker crown.
Identification & Characteristics
Colors
- Primary
- Blue
- Secondary
- White
- Beak
- Yellow
- Legs
- Brown
Attributes
Understanding Attributes
Rated 0–100 based on research and observation. A score of 50 is average across all bird species. These attributes are relative and don't necessarily indicate superiority.
Habitat & Distribution
Great Blue Herons inhabit various wetland habitats, including marshes, swamps, rivers, and coastal areas across North and Central America. They are found from southern Canada to northern South America, including the Caribbean.
In the United States, they are widespread and can be seen year-round in many areas, with northern populations moving south for winter. They are also present in parts of coastal Alaska during the summer months.
Distribution
Diet
Great Blue Herons are opportunistic feeders, primarily consuming fish, but also amphibians, reptiles, small mammals, and invertebrates. They hunt by standing still or wading slowly, then striking with their sharp bills to spear or grab prey. These adaptable birds may also forage in fields for rodents.
Behaviour
Great Blue Herons are often seen standing motionless in shallow water, waiting to strike at prey with lightning speed. They are generally solitary foragers but may gather in loose colonies for breeding. These birds fly with slow wingbeats, their necks folded in an S-shape and their legs trailing behind.
Calls & Sounds
The Great Blue Heron's primary call is a loud, harsh squawk, often heard when the bird is startled or in flight. During courtship and at breeding colonies, they produce a variety of guttural sounds and bill claps. A typical call might be described as a raspy 'frahnk' or 'gawwk'.
Nesting & Breeding
Great Blue Herons typically breed in colonies, often with other wading bird species. Pair formation begins in early spring, with elaborate courtship displays involving neck stretching and bill clapping.
Nests are large platforms of sticks, usually built high in trees near water. Females lay 2-6 pale blue eggs, which both parents incubate for about 28 days.
Chicks are altricial and fledge at about 60 days old, though they may return to the nest for several weeks after for feeding.
Conservation
While the Great Blue Heron is currently listed as Least Concern, it faces threats from habitat loss and degradation of wetlands. Conservation efforts focus on protecting and restoring wetland habitats, as well as reducing pollution in aquatic ecosystems where these birds feed and breed.
Birdwatching Tips
- Look for them in wetlands, along shorelines, and in shallow waters
- Observe early morning or late afternoon when they're most active
- Listen for their distinctive harsh squawk
- In flight, note their large size and S-curved neck
- Check for nesting colonies in tall trees near water bodies
Did You Know?
- Great Blue Herons can hunt day and night thanks to a high percentage of rod-type photoreceptors in their eyes.
- They have specialized neck vertebrae that allow them to strike prey at high speeds.
- Despite their large size, their hollow bones make them surprisingly light, weighing only 5-6 pounds.
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