Birds
American Woodcock
Scolopax minor · also called timberdoodle, bogsucker, night partridge
The American woodcock is a bundle of contradictions: a shorebird that never goes near the shore, a plump ground bird that performs one of the most spectacular aerial displays in nature, and an animal whose eyes are so far back that it looks slightly wrong from every angle.
Overview
Scolopax minor lives in young forest and wet thickets across eastern North America. It is a stout, russet, dead-leaf-patterned bird with huge eyes set high and far back on its head, a long straight probing bill, and short legs. It eats mostly earthworms, pulled from soft soil by feel.
Built to see everything
The backward eyes give the woodcock a near-360-degree view, so it can watch overhead and behind while feeding head-down. The trade-off is bizarre: its brain is effectively upside down, the cerebellum sitting below the brainstem, an arrangement found in no other bird.
The rocking walk and the sky dance
It often crosses the ground with a stiff-legged rocking bob — the behaviour that made it an internet favourite. In spring, at dusk, a male “peents” from a clearing, then spirals hundreds of metres up on singing wings and tumbles back down.
Status
Least Concern but declining by about 1% a year, as the young brushy forest it needs disappears. Habitat is now managed by deliberately regenerating woodland patches.
American Woodcock: common questions
Why does the woodcock rock back and forth when it walks?
Nobody is certain, and there are two main ideas. One is that the rhythmic rocking transmits vibrations into the ground that make earthworms move, betraying their position to a bird that hunts largely by feel. The other is that the motion, combined with the woodcock's dead-leaf camouflage, mimics vegetation stirring in the wind and helps the bird stay unnoticed as it crosses open ground. The two are not mutually exclusive. Whatever its function, the bobbing, strutting gait, often set to music in online clips, is a real behaviour and not a trained trick.
Is a woodcock a shorebird or a game bird?
Both, in a sense. Taxonomically the American woodcock is a shorebird, in the sandpiper family, and its closest relatives are the snipes and the Eurasian woodcock. But it has left the shore entirely, living in damp forest and wet thickets and probing woodland soil rather than mudflats. It is also a popular game bird, hunted over pointing dogs in autumn, and its population is monitored through spring surveys of the males' dusk "peent" calls. So it sits at the intersection of shorebird biology and upland bird hunting, which is unusual.
How does the woodcock find worms it cannot see?
The bill tip is packed with pressure-sensitive cells called Herbst corpuscles, and the bird also appears to detect the faint sounds worms make moving through soil. It probes the ground repeatedly, and when it senses prey it can flex just the last third of the upper mandible upward, a mechanism called rhynchokinesis, to grip and pull the worm without having to open its bill against the surrounding earth. The technique works only in soft, moist, worm-rich ground, which is why woodcock are tied to wet woods and why a hard frost or a dry spell forces them to move.
Why is the woodcock declining?
Its numbers track the amount of young, early-successional forest on the landscape, the dense stands of saplings and shrubs that grow up after a disturbance such as logging, fire, or farm abandonment and then thin out within a couple of decades. Through the twentieth century, farm fields across the eastern US reverted to woods and those woods matured, and modern forestry and fire suppression produce less of the brushy stage the woodcock needs for feeding and for the males' display grounds. Wildlife agencies now deliberately cut and regenerate patches of woodland to keep a supply of young forest, which benefits the woodcock and many other declining shrubland species.