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Activity pattern performed by Greater Flamingos was studied at Najafgarh Jheel Bird Sanctuary from November 2018 to November 2019. During present study different type of behaviours was recoded, and frequency calculated for a different type of behaviours performed among months as well as different time block (morning, afternoon, evening) for adult and immature. A total of 117 hrs were spent in recording activity budget study. Scan sampling and focal sampling methods were adopted to collect the data. A number of behavioural categories, resting (one leg-standing, broken neck posture), preening (twist preen), feeding, alert, aggression (such as chrysanthemum / Threatening, hooking and ritual bickering), movement (marching, flight, walking), wing-salute, inverted wing salute, wing-leg stretching, scratching, drinking, bathing, wing flapping and combat identified. The result revealed that the main behaviours were Feeding, resting and preening. Resting was maximum at morning hours while feeding at its peak during evening hours. Greater Flamingos found to be engaged in feeding (47.16 % ± 1.34) followed by resting (23.85 ± 1.08 %), preening (14.09 ± 0.33 %) movement (6.98 ± 0.76 %) alert (3.30 ± 0.12 %) and aggression (1.44 ± 0.13 %). [ABSTRACT FROM AUTHOR]