Predaceous diving beetle (likely a whirligig or diving beetle)

Freshwater ponds, lakes, streams, and backyard pools; adults often gather near shorelines, docks, and lights.

Adults and larvae are aquatic predators that eat mosquito larvae, other insects, small crustaceans, and occasionally tadpoles or small fish.

Strong swimmers that surface to trap air beneath their wing covers, then dive to hunt or evade predators. Adults can fly between water bodies, especially at night.

Harmless to people, though large individuals may deliver a defensive pinch if handled. They benefit aquatic ecosystems by controlling insect and other small-animal populations.