Wading Birds: A Field Guide to Standing Very Still

They're the birds people notice first — large, pale, standing motionless in shallow water. They're also the ones most often named wrong, because several look broadly similar at a distance and one changes colour completely as it matures.

The large ones

Great blue heron. The biggest wader here. Slate grey-blue, roughly four feet tall, with a heavy yellowish bill. In flight the neck folds back into an S — a diagnostic worth knowing, because herons fly with retracted necks and other long-necked birds don't.

Great egret. All white, nearly as tall, with a yellow bill and black legs. In breeding season it grows long trailing plumes on the back. Those plumes are the reason the species was hunted nearly to extinction for the millinery trade, and the reason the first bird protection laws in the United States exist.

The medium ones, where mistakes happen

Snowy egret. Smaller than a great egret, white, with a black bill and bright yellow feet. The yellow feet are the field mark — visible even at distance when the bird moves. It feeds actively, stirring the bottom with one foot to flush prey, which is very different from the great egret's patience.

Little blue heron. Adults are dark slate blue with a purple-toned head and a pale, dark-tipped bill. First-year birds are entirely white and get confused with snowy egrets constantly. Check the bill: pale with a dark tip, not black. Juveniles moulting into adult plumage go through a patched white-and-blue stage that looks like nothing in the book.

Tricolored heron. Slim, dark above, with a distinctive white belly and a white stripe up the front of the neck. Active feeder, often in deeper water than the others.

Green heron. Small, stocky, dark, easy to overlook. Sits hunched at the water's edge. One of the very few birds known to use tools — it will drop a feather or insect on the surface as bait and wait for fish.

Ibises and others

White ibis. White with black wingtips and a long, decurved red-orange bill. Feeds by probing rather than watching, often in flocks. Juveniles are brown above and white below.

Black-crowned and yellow-crowned night-herons. Stocky, short-necked, active mainly at dawn and dusk. The yellow-crowned specialises in crabs.

How to tell them apart in practice

Bill and legs before plumage. Colour of soft parts separates the confusing pairs far more reliably than body colour, which changes with light, age and season.

Watch how it feeds. Great egrets and great blue herons stand and wait. Snowy egrets and tricolored herons move constantly. Ibises probe. Behaviour identifies a distant bird when detail is impossible.

Size needs a reference. "Large" is meaningless alone. Compare against another bird nearby.

Check for juveniles. Any all-white medium wader on this coast might be a young little blue heron. Look at the bill first.

Watching them well

Approach slowly and stop before the bird changes behaviour. A heron that stops hunting and stands upright watching you is about to leave; you are already too close.

Sit down. A seated human reads as far less threatening, and a patient observer will often have a bird resume feeding within a few minutes at a distance it wouldn't have tolerated on approach.

Early morning and late afternoon are best for both light and activity. Falling tide concentrates fish in shrinking shallows and produces the most active feeding of the day.