Green Heron

Identification

The green heron is a relatively small heron with an adult body length of about 44 cm (17 in). Adults are distinctive with a glossy, greenish-black cap, an iridescent greenish back and wings that are gray-black grading into green or blue, and a chestnut neck with white lines running down the front. The underparts are gray, and the legs are short and yellow. The bill is dark with a long, sharp point. Females tend to be smaller than males with duller and lighter plumage, particularly during breeding season. Juveniles are much duller, with brown and white streaking on the head sides, neck and underparts, tan-splotched wing coverts, and greenish-yellow legs and bill.

Range & habitat

The green heron is found throughout North and Central America, with different subspecies occupying distinct regions. The nominate subspecies breeds from southeastern Canada to central and southern US east of the Rocky Mountains, extending south through Central America to central Panama and the Caribbean islands. Northern populations are migratory, wintering from the southernmost US to northern South America, while other subspecies in the western US, Bahamas, and southern Baja California are year-round residents or show partial migration.

Green herons inhabit riparian zones, wetlands, ponds, and lakes, as well as human-made canals and ditches. They are intolerant of other birds when feeding and typically forage alone, standing still on shore or in shallow water or perching on branches to hunt.

Behaviour & diet

Green herons are vocal birds with a loud, sudden kyow call and more subdued kuk calls. During courtship, males produce raah-rahh calls with wide-open bills, make noisy wingbeats and whoom-whoom-whoom calls in flight, and give various other calls including roo-roo and aaroo-aaroo. They do not exhibit particular preference for day or night foraging, and shore-dwelling individuals adapt to tidal rhythms.

These herons mainly eat small fish, frogs, and aquatic arthropods, but opportunistically take leeches, earthworms, dragonflies, damselflies, waterbugs, grasshoppers, spiders, crayfish, prawns, mice, lizards, tadpoles, and snakes. Fish prey includes minnows, sunfish, catfish, perch, and eels. Remarkably, green herons have been observed using bait-fishing behavior, employing captured prey or objects like bread and feathers as lures on the water's surface to attract fish.

Best time & places to see it

Northern populations move to their breeding ranges during March and April, with breeding well underway by late May at the northernmost limits. Migration to winter quarters begins in September, with birds absent from non-resident regions by late October. Look for green herons at any wetland, pond, lake, canal, or ditch throughout their range, watching along shorelines and overhanging branches where they patiently hunt.

Photography tips

The green heron's small size and solitary hunting behavior make it a rewarding subject for patient photographers. Their tendency to stand motionless on shore or perch on branches offers good opportunities for approach, though they are wary. The iridescent greenish back and contrasting chestnut neck are best captured in good light. Early morning or late afternoon light will enhance the metallic sheen of their plumage. Focus on their short yellow legs and distinctive pointed bill as identifying features in your compositions.