What is a primary food source for woodcocks?

The correct choice identifies worms as a primary food source for woodcocks, which is consistent with what is known about their feeding behavior. Woodcocks primarily forage on the ground in moist, wooded areas where they probe the soil with their long, sensitive bills to find invertebrates.

Worms, particularly earthworms, are abundant in their preferred habitats and are a significant part of their diet. This digging behavior allows woodcocks to extract these worms effectively, making them an important nutritional resource, especially during their migrations when food availability is crucial.

Other choices do not align as closely with the woodcock's typical diet. While berries and insects can be part of their diet, they are not the primary food source, as woodcocks rely heavily on soil-dwelling organisms like worms for the bulk of their nutrition. The mention of “Works” appears to be a typographical error or confusion and does not relate to the known diet of woodcocks.