Urbanisation and the associated fragmentation of natural habitats are among the fastest-acting drivers of behavioural change in wild animal populations. Because behaviour can be modified within a single lifetime, it is often the first trait to respond to novel anthropogenic pressures, well before morphological or genetic change becomes detectable. This paper synthesises evidence across four behavioural domains reported in the urban ecology literature — boldness and antipredator response, acoustic signalling, activity-pattern timing, and dispersal-linked personality — and uses this synthesis to design an original, implementable comparative field study in the common myna (Acridotheres tristis), a synanthropic species widespread across South Asia and among the world's most successful urban avian colonisers. The proposed study compares flight initiation distance (FID), time-activity budgets, and foraging-substrate diversity of myna populations across a three-level urbanisation gradient (rural/continuous habitat, suburban/fragmented habitat, and urban core/highly fragmented habitat) in Jammu, India. Because original field data collection was outside the scope of this exercise, illustrative results are simulated from published effect sizes to demonstrate the expected analytical outcome and are explicitly labelled as such throughout. Findings are interpreted in relation to the habituation-versus-adaptation debate, the boldness–dispersal personality syndrome, and the ecological-trap hypothesis, with implications drawn for urban green-space planning and wildlife management. The paper concludes that behavioural plasticity, while enabling short-term persistence of generalist species in fragmented landscapes, may carry longer-term fitness costs that warrant further longitudinal, physiological, and genetic investigation.