With reference to India's biodiversity, Ceylon frogmouth, Coppersmith barbet, Gray-chinned minivet and White-throated redstart are

The Ceylon frogmouth, Coppersmith barbet, Gray-chinned minivet, and White-throated redstart are all avian species found in diverse Indian habitats ranging from the Western Ghats to the Himalayas. Option (d) Amphibians is the most tempting distractor because the name "Ceylon frogmouth" often misleads candidates to think of frogs, though it is actually a nocturnal bird with a wide gape. This question tests the core concept of identifying Indian fauna and their taxonomic classifications, a recurring theme in UPSC biodiversity assessments.