Male and female Lesser Yellowlegs are visually very similar, with no significant plumage or size differences. Both sexes share a mottled gray-brown upperparts, white underparts, and bright yellow legs. Females tend to have slightly longer wings on average.

Detailed Description:
• Size and Shape: Lesser Yellowlegs are medium-sized shorebirds, known for their long, bright yellow legs, long necks, and slender, straight, dark bills.
• Plumage: In breeding plumage, they have a mottled gray-brown back, with white underparts that are streaked with brown on the neck and breast. Outside of the breeding season, their plumage is more uniformly gray above and white with gray spotting below.
• Distinguishing Features: The straight, dark bill is shorter and more slender than that of the Greater Yellowlegs, and only slightly longer than the head.
• Sexes: While males and females are similar in appearance, females have slightly longer wings on average.
• Behavior: They have a graceful, high-stepping gait and a distinctive "tu-tu" call.

Key Differences from Greater Yellowlegs:
• Lesser Yellowlegs are smaller overall.
• Their bills are shorter and straighter than the slightly upturned bill of the Greater Yellowlegs.
• Their calls are different, with the Lesser Yellowlegs having a two-noted call and the Greater Yellowlegs having a three to four-noted call.