Head to head
Great Blue Heron vs Sandhill Crane
Herons and cranes are both tall, long-legged, long-necked birds of open wetlands, and people mix them up constantly, especially in flight. In North America the confusion is usually between the great blue heron and the sandhill crane, which overlap across much of the continent. They are not closely related, and the way each one flies tells you which is which in a second.
| Great Blue Heron | Sandhill Crane | |
|---|---|---|
| Bird family | Herons (Ardeidae) | Cranes (Gruidae) |
| Neck in flight | Folded back into an S; head between the shoulders | Stretched straight out ahead |
| Diet | Fish, frogs, small mammals, birds; a stab-hunter | Mostly grain, tubers, and plants, plus some invertebrates |
| Social life | Hunts alone; nests colonially in treetops | Often in flocks; nests alone on the ground |
| Voice | A harsh, low croak | A loud rolling bugle from a coiled windpipe |
| Head | Black head plume; no bare skin | Bare red skin on the crown |
| Behaviour | Still and watchful | Walks and forages actively; performs dances |
| Migration | Partial; some populations move south for winter | Long-distance; huge staging flocks, as on the Platte River |
Heron vs Crane: common questions
How can I tell a heron from a crane when one flies over?
Look at the neck. A heron, including the great blue heron and all the egrets, flies with its neck folded back on itself in a tight S, so the head is tucked in close to the body and the bird looks front-heavy and short-necked in the air. A crane flies with its neck held straight out in front, in line with the body and the trailing legs, giving it a long, arrow-straight profile. Storks and ibises also fly neck-out, but in North America a big grey bird flying with an outstretched neck, often in a group and often calling with a rolling bugle, is a sandhill crane, and one flying with the neck pulled in, usually alone and silent, is a great blue heron.
Are herons and cranes related?
Not closely. Herons belong to the order Pelecaniformes, alongside pelicans, ibises, and spoonbills, while cranes are in the order Gruiformes with rails and limpkins. They have arrived at a similar body plan, tall, with long legs for wading and a long neck for reaching, because that design suits life in shallow wetlands, but the resemblance is convergence rather than kinship. Their differences run deep: the folded versus extended neck reflects different neck anatomy, the stab-hunting versus grazing diet reflects different bills and behaviour, and cranes perform elaborate dances and pair for life in a way herons do not.
Why do sandhill cranes gather in such huge numbers?
Because their migration funnels through a few key stopover sites where they refuel. The most famous is the Platte River in Nebraska, where in late winter and early spring several hundred thousand sandhill cranes, a large fraction of the mid-continent population, gather for a few weeks to feed in the surrounding cornfields by day and roost on the wide shallow river at night, safe from predators. Concentrating like this lets the birds fatten quickly for the flight to their northern breeding grounds and provides safety in numbers, but it also makes them dependent on a small number of places, which is why conserving those staging grounds matters so much. Great blue herons, being solitary hunters, never concentrate this way except at their tree-nesting colonies.