The chicken is a fowl. The definition of a fowl is a bird used for food. A hen is an example of fowl. Chicken is an example of fowl. fowl. the duck, goose, turkey, etc. a full-grown chicken, as distinguished from a springer, etc. fowl.
Data collection and search-and-rescue missions are faster and more efficient with a team of drones to pool data and provide redundancy in case some machines fail. But the use of more vehicles also adds complexity. Drones working together have to be able to communicate with one another and make collective decisions.
Today drones are no longer only operated by the military, with smaller versions used for all sorts of purposes by companies and individuals. For example, Amazon and Google say they are developing drones that deliver parcels. Facebook wants to fly giant drones that can carry internet signal to remote areas.