The grey kestrel feeds on various preys sucha s large insects, small reptiles, small birds, rodents, bats and amphibians. It may sometimes eat oil palm fruits.It usually occurs singly or in pairs, but swarming termites often attract foraging flocks. This small falcon hunts usually from high exposed perch, mainly during the warm hours of the day, when preys are active. Once the prey is detected, il flies down the perch and catches it on the ground, low branches or foliage.
It may run along the ground for termites. It also flies in slow prospecting flight. It is able, like most falcons, to perform fast aerial chases with rapid winbeats, and insects are often caught by aerial hawking. However, this species rarely hovers.