Grey Heron vs Great Blue Heron

In short

The Grey Heron and Great Blue Heron are large, similarly structured birds with overlapping habitats, but they can be distinguished by their plumage and regional presence. The Grey Heron is found in the Old World, while the Great Blue Heron is native to North America. Key differences include the Grey Heron's black crown stripe and the Great Blue Heron's overall bluer tone.

Identification tips

1. Location: Grey Herons are in the Old World; Great Blue Herons are in North America. 2. Head Markings: Look for the Grey Heron's distinct black crown stripe. 3. Plumage Tone: The Great Blue Heron has a more uniform blue-gray tone. 4. Size: The Great Blue Heron is slightly larger, but size can be hard to judge in the field.

Size

Both species are similar in size, with the Great Blue Heron being slightly larger overall.

Plumage

The Grey Heron has a white head with a broad black stripe extending from above the eye to the back of the crown, while the Great Blue Heron has a more uniformly blue-gray appearance with a black stripe on the head that is less pronounced. The Grey Heron shows countershading with slate gray to blue dorsally and light gray to white ventrally.

Behaviour

Both species are opportunistic feeders, primarily consuming fish and amphibians. They exhibit similar foraging behaviors, such as standing motionless or slowly stalking prey.

Habitat

Grey Herons are found across Europe, Asia, and Africa, using a variety of habitats from woodlands to wetlands. Great Blue Herons are native to North America, frequenting coastal and freshwater habitats, often nesting in large colonies.

Voice

Both species have similar harsh, croaking calls, but specific vocalization differences are not well-documented.