Which type of duck dives for fish, crustaceans, and water plants?

Diving ducks are specialized for a diet that includes fish, crustaceans, and aquatic plants, which they access by diving underwater. Unlike other duck types, which may feed on the surface or in shallow areas, diving ducks are adept swimmers that can reach deeper water where their food sources are located. This group includes species such as canvasbacks and redheads that are characterized by their ability to dive rather than just dabble or forage on the water’s surface.

In contrast, wood ducks and puddle ducks primarily feed in shallower waters, foraging on the surface or just below without diving deep. Teal ducks, while also dabbling types, are not inclined to dive for food, focusing instead on more readily accessible food sources. Thus, the diving duck is the specific type of duck that effectively searches for its food sources through diving, making it the correct answer.