Collared Pratincole
Glareola pratincola
This pratincole is 24–28 cm (9.4–11.0 in) long with a 60–70 cm (24–28 in) wingspan. It has short legs, long pointed wings, a long forked tail, and a short bill, which is an adaptation to aerial feeding. The back and head are brown, and the wings are brown with darker flight feathers. The belly is white. The underwings are chestnut, but look dark below. Very good views are needed to distinguish this species from other pratincoles, such as the black-winged pratincole and the oriental pratincole, which may occur in its range.
ID text from Wikipedia, CC BY-SA 4.0
Oriental Pratincole
Glareola maldivarum
The Oriental pratincole has short legs, long pointed wings and long forked tails. It has a short bill, which is an adaptation to aerial feeding. The back and head are brown, and the wings are brown with black flight feathers. The belly is white and the underwings are chestnut. Very good views are needed to distinguish the species from other pratincoles, particularly the very similar collared pratincole, which also has a chestnut underwing. The black-winged pratincole shares the black upperwing flight feathers, and lacks a white trailing edge to the wing.
ID text from Wikipedia, CC BY-SA 4.0

Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Collared Pratincole and Oriental Pratincole.