THE ANIMAL FILES

Great blue heron

Ardea herodias

A still heron can be hunting, not resting.

Great blue herons feed around wetlands, coasts and other waters, with fish an important but not exclusive food. They often stand or wade before a rapid strike. Open water can also influence whether birds remain through a northern winter.[1]

Follow the evidence ↓
Great blue heron
Image: Acarpentier · Commons · CC BY 3.0
Search
Largely by sight[1]
Food
Fish, amphibians and other small animals[1]
Habitats
Freshwater and coastal wetlands[1]

Patience followed by speed

A typical hunt combines slow wading or standing with a quick bill strike. Fish species taken depend on local availability, and other prey include frogs, crustaceans and small mammals. A prolonged still posture may therefore be part of active food search rather than a break from feeding.[1]

Several ways to reach prey

Observed feeding also includes probing, walking quickly, dropping from perches and other tactics. Solitary feeding is common, although loose gatherings occur where fish are concentrated. The long legs permit access to shallow-water feeding sites, but the species is not confined to one depth or one prescribed movement.[1]

Winter depends on usable water

Marshes, lake edges, mangroves and shorelines can all supply habitat. Some northern birds migrate, while others remain when fish-bearing waters stay unfrozen. Streams and rivers can provide such access. Nesting commonly occurs in trees or shrubs near water, connecting feeding and breeding sites within a landscape.[1]

A COMMON MIX-UP

Does a heron motionless in water have to be asleep?

No. Waiting and visually locating prey are part of its hunting repertoire.[1]

TRY A LITTLE REASONING

Why could a flowing winter stream support a heron when a frozen pond does not?

Reveal the explanation

Unfrozen water keeps aquatic prey accessible; ice can block access even if fish remain underneath.[1]

Sources & editorial notes

Adapted and translated from the cited Wikipedia revisions, with source-linked reasoning. Image credit and licence are listed separately above.

Adapted and translated from Wikipedia contributors; exact revisions are linked below. CC BY-SA 4.0

  1. Wikipedia contributors — Ardea herodias (adapted and translated; exact revision)
  2. NCBI Taxonomy — Ardea herodias (identity and game lineage)

Last fact check:

One discovery leads to another

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