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Pallas's Sandgrouse and Black-bellied Sandgrouse can be distinguished by their plumage patterns and tail shape. Pallas's Sandgrouse has a more elongated tail with central feathers extending beyond the rest, while Black-bellied Sandgrouse has a more compact tail. Their plumage also differs, with Pallas's showing more intricate patterns.

Look for the elongated tail of Pallas's Sandgrouse, where the central feathers extend beyond the rest. In contrast, the Black-bellied Sandgrouse has a more compact tail. Pay attention to the plumage patterns; Pallas's has more intricate designs.

Pallas's Sandgrouse has a more intricate and detailed plumage pattern compared to the Black-bellied Sandgrouse, which tends to have a more uniform appearance. Additionally, Pallas's Sandgrouse often shows a more pronounced contrast in its feather patterns.