Birds of the California Delta (Page in Progress)

The Great Blue Heron (Ardea herodias) is the largest and most widespread heron in North America, reaching up to 4.5 feet in height with a wingspan of up to 7 feet. These "statuesque" birds are common sights near almost any body of water, ranging from coastal marshes to urban park ponds. Quick Facts

• Scientific Name: Ardea herodias.
• Identification: Slate-blue body, long yellow-orange bill, and a white head with a black stripe.
• Flight Style: They fly with their necks tucked into an "S" shape, unlike cranes which fly with their necks extended.
• Specialized Feathers: They have "powder down" on their chests that they use like a washcloth to remove fish slime and oils from their plumage.
• Lifespan: They typically live about 15 years, though some have been recorded reaching age 24. 

Diet and Hunting Great Blue Herons are patient, opportunistic hunters that eat almost anything within striking distance. 

• Technique: They often stand motionless or wade slowly in shallow water, waiting for prey to come near before striking with lightning speed.
• Main Prey: Fish make up about 75% of their diet.
• Other Food: They also consume frogs, snakes, lizards, insects, small mammals (like mice or gophers), and even other birds. 

Nesting and Behavior

• Colonies: They typically nest in groups called heronries (or rookeries), often high in trees to avoid predators like raccoons or coyotes.
• Mating: They form new pair bonds each year through elaborate courtship displays that include "bill clappering" and stick transfers.
• Offspring: Both parents incubate the 2–6 pale blue eggs and feed the chicks regurgitated food for about two months. 

Conservation Status Once hunted heavily for their plumes to decorate hats, Great Blue Herons have since recovered and are now a species of Least Concern. They are protected under the Migratory Bird Treaty Act, making it illegal to harm them or their nests.