Acorn woodpecker in an oak tree during winter.

An acorn woodpecker stands on a branch of an oak tree in February at Phoenix Park in Sacramento County, California. This area is north of the American River beyond the bluffs. The park has baseball fields but also is home to a rare habitat, vernal pools. Vernal pools form during the winter and as they dry, several plant and animal species go through their entire life cycle to take advantage of the presence of water. For the rest of the year, the ground is dry. Acorn woodpeckers are the only woodpeckers that nest in colonies and feed on acorns.

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