It perches conspicuously on wires or other exposed perches within its territory, and is a frequent sight in south Asia. This species mainly hunts large crustaceans, insects, earthworms, rodents, lizards,[26] snakes, fish and frogs. Predation of small birds such as the Indian white-eye, chick of a red-wattled lapwing, sparrows and munias have been reported. The young are fed mostly on invertebrates. In captivity, it has been noted that it rarely drinks water although bathing regularly.
Birds have sometimes been seen attracted to lights at night, especially during the monsoon season, suggesting that they are partly migratory.
With a powerful bill and rapid flight, these kingfishers have few predators when healthy and rare cases of predation by a black kite and a jungle crow may be of sick or injured birds. An individual found dead with its beak embedded into the wood of a tree has been suggested as an accident during rapid pursuit of prey, possibly an Indian white-eye. A few parasites have been noted.
In the 1800s these birds were hunted for their bright feathers that were used to adorn hats. It is the State bird of West Bengal.