Correct Option
The Common Myna (Acridotheres tristis) is frequently observed in agricultural and rural landscapes. It exhibits a commensalistic feeding relationship with grazing livestock. As cattle move through grasslands, they disturb insects, which the Common Myna then preys upon. This behaviour is a classic example of commensalism, where one species benefits (the bird) and the other (the cattle) is neither significantly harmed nor benefited.
Incorrect Options
The Painted Stork (Mycteria leucocephala) is a large wading bird. Its primary feeding strategy involves probing shallow water bodies and mudflats with its long bill to catch fish, amphibians, and aquatic invertebrates. It does not typically follow grazing cattle to feed on disturbed insects.
The Black-necked Crane (Grus nigricollis) is a migratory bird species found in high-altitude wetlands, marshes, and river valleys, particularly in regions like Ladakh and Arunachal Pradesh. Its diet primarily consists of roots, tubers, insects, snails, and small fish found in its wetland habitats. It does not exhibit the behaviour of associating with grazing cattle for foraging.