The Little Blue Heron is sometimes referred to as the blue crane, levee walker, or little blue crane.
They have a commensal relationship with White Ibises (Eudocimus albus). The ibises stir up food as they walk, increasing the number of prey available to the Little Blue Herons. The herons benefit, while the ibises are unaffected. (Riegner 1998, Terres 1980)
Perception Channels: visual ; tactile ; acoustic ; chemical
The major problem facing these birds is the loss of their wetland habitats. Little Blue Herons need clean, undisturbed wetlands for feeding and breeding. Colonies are being lost because of clear cutting of forests, and draining of ponds, lakes, and wetlands. The use of pesticides has also caused eggshell thinning. The population has been decreasing and the Little Blue Heron is considered threatened and of special concern in some coastal areas. (Katusic 1998, Riegner 1998)
US Migratory Bird Act: protected
US Federal List: no special status
CITES: no special status
State of Michigan List: no special status
IUCN Red List of Threatened Species: least concern
The Little Blue Heron has no negative affect on humans.
The Little Blue Heron is enjoyable to watch and helps control insect populations. (Riegner 1998)
Egretta caerulea feed mainly during the daylight hours. They are carnivorous, with their diet consisting of fish, frogs, lizards, snakes, turtles, and crustaceans such as fiddler crabs, crayfish and shrimp. They also eat aquatic insects and spiders. When swamps and marshes become dry, they live on grasshhoppers, crickets, beetles and other grassland insects.
The Little Blue Heron's long legs enable it to wade into the water, where it walks slowly along an area in order to locate prey, often retracing its steps or standing motionless. They sometimes rake the ground with their foot to disturb prey into movement and stretch their long necks to peer into the water. Their long beak is used to jab and eat the prey. Extensive studies found the heron's prey capture success rate to be about 60 percent. (Terres 1980, Riegner 1998)
The Little Blue Heron is found along the Atlantic coast from Massachusetts to Florida, but is most abundant along the Gulf of Mexico. It also nests in the West Indies, and along both Mexican coasts through Central America and into South America. Its range can also extend into the Amazon Basin, the Caribbean, and the more northern regions of North America. (Riegner 1998)
Biogeographic Regions: nearctic (Native ); neotropical (Native )
Although Egretta caerulea often lives near saltwater, it is mainly an inland bird. They prefer freshwater areas such as ponds, lakes, marshes, swamps, and lagoons, but also sometimes occupy flooded and dry grasslands, or marine coastlines. (Riegner 1998, Terres 1980, Tarski 2001)
Terrestrial Biomes: forest ; rainforest ; scrub forest
Average lifespan
Status: wild: 167 months.
The Little Blue Heron is a small, dark bird that ranges from 63-74 centimeters in length. It can have a wingspread of up to 1.04 meters. The sexes look similar, but the young look very different from the adults. An adult can be recognized by its purple-maroon head and neck. The rest of the plumage is slate gray. The long neck is usually held in an "S" shaped curve while the bird is at rest or in flight. The heron's long, slender bill curves slightly downward, and is also dark gray but has a black tip. The eyes are yellow and the legs and feet are dark. The young are unlike any other heron because they have all white body plumage. They have a blue bill with a black tip and dull green legs. They stay white through their first summer, fall, and into winter, but start molting in February into the dark color of an adult. (Terres 1980; Tarski 2001)
Average mass: 396 g.
Other Physical Features: endothermic ; bilateral symmetry
Average mass: 215.6 g.
The pale, blue-green eggs of the Little Blue Heron are laid in April. They can lay from 3-5 eggs, but on average lay 4-5. This process takes 5-8 days, with one egg being laid every other day. Both sexes incubate the eggs until they hatch in 22-24 days, and then quickly remove the eggshells from the nest. It may take about 5 days for all of the chicks to emerge. Although the young can raise their heads, they spend most of their time lying on the nest floor. Both parents feed them by dropping food into the nest and later placing it directly into the chicks' mouths. In about 3 weeks, the young are ready to leave the nest for short trips along surrounding branches. When they are 30 days old, they are able to fly and periodically leave the nest area. Soon after, at 42-49 days, the young are on their own. Little Blue Herons can breed when they are one year old. They have been recorded as living more than 7 years in the wild. (Riegner 1998, Terres 1980, Katusic 1998)
Key Reproductive Features: iteroparous ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; oviparous
Average time to hatching: 23 days.
Average eggs per season: 4.
