Urbanisation has altered resource availability, driving behavioural and ecological change in synanthropic species such as the Australian White Ibis (Threskiornis molucca). This adaptability has intensified human-wildlife conflict, highlighting the need to understand behavioural responses, habitat connectivity needs, and sex-specific habitat use. This study integrates GPS telemetry with citizen-science resightings to examine sex-specific habitat selection and movement behaviour across the Moreton Bay Region in southeast Queensland. Sixteen ibis (9 females, 7 males) were GPS-tracked between September 2023 and December 2024, yielding 80,984 fixes. Concurrently, 767 citizen science sightings of 171 tagged ibis were collected via the Big City Birds application. GPS-based multinomial GLMs revealed significant sex differences in land-use selection. Both sexes concentrated in intensive land uses, yet males did so more strongly (80.9% vs. 61.1%), favouring waste-treatment and river habitats, whereas females used services, residential, and conservation areas. Males travelled farther daily and displayed larger home ranges, while diel activity peaked near 10:00 and 20:00 with minimal nocturnal movement. Citizen science data reflected similar broad patterns but lower spatial precision and weaker sex differentiation, though it uniquely captured long-distance dispersal events (≈200–400 km). These findings demonstrate that GPS telemetry resolves fine-scale, sex-specific behavioural ecology, while citizen-science approaches provide population-level breadth and detection of rare events. Integrating both methods offers a scalable framework for monitoring urban wildlife and informing adaptive management. Effective intervention should focus on high reward anthropogenic sites (e.g., waste facilities) and time control efforts around dawn-dusk peaks to reduce conflict while minimising disruption to breeding females.