It won’t be long until the great blue herons return to the Wachusett Meadow in March.

Herons are important for the environment as they act as “indicator species”. Scientists monitor heron populations to detect environmental contamination, such as toxins in the water or mercury levels in eggs, which reflects the health of the entire ecosystem.

Although they are named “great blue”, herons can look grey or brown depending on the light conditions.

This great blue heron does look blue. Herons appear bluest in low light, fog, or shadows, which reflect cooler, blue tones.

This heron is taking advantage of the All-Persons Observation Deck.

Herons are known for their exceptional camouflage, often appearing nearly invisible when perched among dead branches, or debris.

This heron can see well from high up in the tree. Its eyesight is estimated to be about three times more detailed than a human’s. From this high perch, a heron can spot small movements below.

Great Blue Herons are expert fishers, but they will eat almost anything they can catch and swallow. In a meadow, herons hunt for small mammals, which can make up a large portion of its diet, especially in winter when waterways freeze . 

The Great Blue Heron is widely considered one of the most prehistoric-looking birds alive today. While all birds are living descendants of dinosaurs, herons appear more like dinosaurs because of their large size, sharp angles and guttural sounds.

They can form their necks into an S-shaped curve which acts like a coiled, spring-loaded mechanism. This allows them to catch prey in the water with high speed and precision.