Why do some woodpeckers feed on ants on the ground?

Woodpeckers are primarily known for their arboreal lifestyle, but some species have adapted to forage on the ground because ants are a favorite food source, particularly in tropical regions.1

While most woodpeckers spend their lives spiraling up tree trunks to find insects, ground-feeding behavior is a specialized strategy for certain species. For example, the ground woodpecker (Geocolaptes olivaceus), the campo flicker (Colaptes campestris), and the Andean flicker (C. rupicola) are ground dwellers that feed almost exclusively on ants. Additionally, seven or eight other woodpecker species frequently forage on the ground to exploit this food source.12

This behavior is highly effective, as fully half of the numerous tropical woodpecker species feed largely or entirely on ants. By descending to the ground, these birds gain access to abundant ant colonies, a niche that complements their diverse foraging modes, which also include gleaning items from tree surfaces and probing into cracks.1