Which of the following is not a bird ?

This snippet gives an example of a species described explicitly as a 'nocturnal bird' (Jerdon's Courser), showing that books treat named taxa as bird species and note nocturnality as a species trait.

A student could use this pattern to check bird species lists or field guides for other named nocturnal birds (like 'Indian Nightjar') to see if they are listed similarly.

This snippet states India has about 1,200 species of birds, indicating extensive avifauna and that many named forms are catalogued as bird species.

A student could consult the referenced kinds of inventories or national bird lists (or check if 'Indian Nightjar' appears among the catalogued species) to evaluate the statement.

This snippet gives a bird count for India (~2,000 species) and examples of common named birds, showing that named vernacular forms are commonly used in Indian avifaunal records.

Using this, a student might look up national/regional checklists or bird guides (which list many named species) to see whether 'Indian Nightjar' is recorded.

This snippet lists many bird types found in India (peacocks, cranes, parakeets), illustrating that common names refer to species/groups in these texts.

A student could apply the same approach—searching such common-name lists or local field guides for 'Indian Nightjar'—to judge if it corresponds to a recognized bird species.

This snippet shows the texts name particular bird species (peacock, sarus-crane, great Indian bustard) as entries in fauna lists, implying that similarly formed names (e.g., 'Indian Nightjar') may denote species.

A student could compare the format and usage of named birds here with the term 'Indian Nightjar' and then verify via a species checklist or field reference.

Lists of migratory birds include species with common names using a colour + bird-type pattern (e.g., 'White Wagtail'), showing that 'White X' is a standard naming pattern for birds.

A student could use this naming pattern plus a bird field guide or checklist to look for 'White Ibis' as a similarly formed common name.

Mention of 'White-rumped vulture' and other 'white'-prefixed bird names demonstrates that 'White-' is commonly used in English bird common names.

Extend the pattern: if 'White' commonly prefixes bird names, search regional or global bird lists for 'White Ibis' as a plausible common name for a species.

A published inventory of Indian vultures shows detailed species-level common names are used in these references, implying similar treatment for other bird groups (e.g., ibises) in such lists.

Use similar species lists or national bird checklists (which these books compile) to check whether an entry named 'White Ibis' appears.

Keoladeo-Ghana bird sanctuary dominant species include wetland waders such as 'spoon-bill' and 'heron', which are the same ecological group as ibises (wading water birds).

Knowing ibises are wading water birds, a student could check wetland bird lists and sanctuaries (like Keoladeo) for presence of any 'Ibis' species, including one called 'White Ibis'.

The text describes major flyways covering migratory water bird species, indicating that many named water-bird species occur across regions and are catalogued by such conventions.

A student could consult migratory water-bird lists associated with flyways to see if 'White Ibis' appears among named migratory water birds.