The northern flicker [Colaptes auratus] is a medium-sized member of the woodpecker family. It is native to most of North America, parts of Central America, Cuba, the Cayman Islands, and is one of the few woodpecker species that migrate. There are over 100 common names for the northern flicker. Among them are: yellowhammer, clape, gaffer woodpecker, harry-wicket, heigh-ho, wake-up, walk-up, wick-up, yarrup, and gawker bird. Many of these names are attempts at imitating some of its calls.
According to the Audubon guide, “flickers are the only woodpeckers that frequently feed on the ground”, probing with their beak, also sometimes catching insects in flight. Although they eat fruits, berries, seeds and nuts, their primary food is insects. Ants alone can make up 45% of their diet. Other invertebrates eaten include flies, butterflies, moths, beetles, and snails. Flickers also eat berries and seeds, especially in winter, including poison oak and ivy, dogwood, sumac, wild cherry and grape, bayberries, hackberries, and elderberries, and sunflower and thistle seeds.
Flickers often go after ants underground [where the nutritious larvae live], hammering at the soil the way other woodpeckers drill into wood. They have been observed breaking into cow patties to eat insects living within. Their tongues can dart out 50 mm [2 in] beyond the end of the bill to snare prey. As well as eating ants, flickers have a behavior called anting, during which they use the acid from the ants to assist in preening, as it is useful in keeping them free of parasites.