Food and feeding in New York City Woodcocks eat mainly invertebrates, particularly earthworms (
Oligochaeta), and it has been known to use
worm charming methods in order to bring the worms to the surface. They do most of their feeding in places where the soil is moist. They forage by probing in soft soil in thickets, where they usually remain well-hidden. Other items in their diet include insect larvae, snails, centipedes, millipedes, spiders,
snipe flies, beetles, and ants. A small amount of plant food is eaten, mainly seeds.
Rocking behavior American woodcocks occasionally perform a rocking behavior where they will walk slowly while rhythmically rocking their bodies back and forth. This behavior occurs during foraging, leading ornithologists such as
Arthur Cleveland Bent and B. H. Christy to theorize that this is a method of coaxing invertebrates such as earthworms closer to the surface. The foraging theory is the most common explanation of the behavior, and it is often cited in field guides. This theory is complicated by observations of rocking while slowly walking across ground that cannot be foraged, such as hard roads or deep snow. An alternative theory for the rocking behavior has been proposed by some biologists, such as
Bernd Heinrich. It is thought that this behavior is a display to indicate to potential predators that the bird is aware of them. Heinrich notes that some field observations have shown that woodcocks will occasionally flash their tail feathers while rocking, drawing attention to themselves. This theory is supported by research done by
John Alcock who believes this is a type of
aposematism. ==Population status==