Male and female Pied-billed Grebes are visually similar, with no outward differences to distinguish the sexes. They are small, stocky, and grayish-brown, with a stout, chicken-like bill. During breeding season, they have a dark brown upper body, grayish-buff sides of the neck and flanks, and a black throat patch outlined in white. The bill is bluish-white with a distinct black vertical bar during the breeding season. Males are slightly larger and heavier-billed than females.

• Size and Shape: Pied-billed Grebes are small and compact, with a short neck and rounded head. They have a stout, chicken-like bill.
• Coloration: Their overall color is brownish, with a darker crown and back. They have a white rump and a short, stubby bill. During breeding season, the bill is whitish with a black band, and the throat is black. In winter, the throat is pale, and the bill lacks the black band.
• Distinguishing Features: The most notable feature is their "pied" (two-toned) bill, which is bluish-white with a black vertical bar during breeding season. They also lack the prominent white wing patches seen in other grebe species.
• Sexual Dimorphism: While males are generally larger and heavier-billed than females, these differences are not readily apparent in the field. The sexes appear identical in plumage and behavior.
• Behavior: Pied-billed Grebes are skilled swimmers and divers, often submerging to catch prey. They are known for their secretive nature and can be more readily heard than seen.