Q. With reference to India's biodiversity, Ceylon frogmouth, Coppersmith barbet, Gray-chinned minivet and White-throated redstart are (UPSC Prelims 2020)
Answer: Birds
Notes: The correct answer is [A] Birds. This question tests the identification of specific avian species found within the diverse ecosystems of the Indian subcontinent.

• Ceylon frogmouth (Batrachostomus moniliger): A small nocturnal bird found in the Western Ghats of India and Sri Lanka. It is known for its wide, hooked bill and excellent camouflage that makes it look like a dry branch.
• Coppersmith barbet (Psilopogon haemacephalus): A common resident bird in the Indian subcontinent, known for its distinctive metronomic call that sounds like a coppersmith hammering metal. It has a bright red forehead and yellow throat.
• Gray-chinned minivet (Pericrocotus solaris): A species of bird in the Campephagidae family. It is found in the Himalayas and parts of Southeast Asia, typically inhabiting subtropical or tropical moist lowland forests.
• White-throated redstart (Phoenicurus schisticeps): A species of bird in the Muscicapidae family. It is found in the high-altitude regions of the Himalayas, inhabiting temperate forests and shrublands.

Key Fact: The Western Ghats and the Eastern Himalayas are two of the major "Biodiversity Hotspots" in India where many of these species, especially endemics like the Ceylon frogmouth, are found. These birds play a crucial role in the ecosystem through seed dispersal and insect population control.