The common swift feed, sleep, it mates and clean their feathers while flighting. The only time they don’t fly is when they are in the nest, hatching eggs or taking care of the chicks. They have become so skilled fliers that they are some of the few birds that can sleep in flight, adjusting their automatic bodies to stay in the air regardless of wind speed.
According to studies conducted with the help of devices, there were cases of monitored common swifts that stayed in the air for up to 10 months continuously.
The common swift (Apus apus) is a medium-sized bird, superficially similar to the barn swallow or house martin but somewhat larger, though not stemming from those passerine species, being in the order Apodiformes. The resemblances between the groups are due to convergent evolution, reflecting similar contextual development.