エリジロツバメチドリ Glareola nuchalis

Small, dark, short-legged pratincole. In flight, shows a white rump and white stripes under the wings. Found mainly on rocks in fast-flowing rivers. Locally will also use sandbars in rivers and rocky islands in lakes. The call is a high-pitched and quickly repeated “kek.” Separated from other pratincoles by its combination of small size, dark coloration, and stripes under the wings.