Mass recruiting and ant pheromone trail is a characteristic behaviour of large ant colonies of Monomorium pharaonis commonly known as pharaoh ants, an invasive ant species with an efficient foraging strategy. The present study on pharaoh ants is to analyse ant trails when food material is placed at different distances from the ant colony (20 cm, 40 cm, 60 cm) keeping the amount of food constant, ant trail analysed when different food quantities (0.95g, 1.85g, 3.7g) were placed keeping the distance between the food material and the ant colony constant and also the change in the ant trail when an obstacle is placed in its path. Number of ants recruited to the food material and the corresponding time taken for recruitment were recorded. Significant behaviour shown by ants during trail formation and the number of ants feeding on the food material were also recorded. More ants were recruited to the food source when distance of food material from the ant colony was 60 cm. Time taken for recruitment was also more when compared to two other distances. Number of ants feeding on the food material and distance showed a positive correlation. More number of ants were recruited when the quantity of food material was 3.7g. Time taken for recruitment was also less when compared two other quantities. A positive correlation was seen between number of ants feeding and quantity of food material. Branching of trail was observed when distance was larger and quantity was higher. Characteristic behaviours that were observed when ant trail was exposed to repellent was cooperation, competition and necrophoresis. Their interaction with each other and by trail pheromone enables them capable of selecting the shortest possible path with greater reliability when an obstacle was placed on its path. Time taken to completely feed on a given quantity of food depended on its quantity. These experiments and their results highlight how rapidly the ants can adjust to the changes put forth in their environment by interacting with each other and also by their sophisticated trail system which have strongly contributed to their dominance over other ant species as a notorious home pest. The behavioural studies on these ants would enable better way to handle them and develop methods to keep them away from human habitation.