Why are large, centralized eradication campaigns against the Red-billed Quelea often impractical?

Answer

The birds are highly nomadic and mobile

Control efforts are challenging because these birds are highly mobile, making large, centralized eradication campaigns impractical and inefficient long-term as flocks migrate.

Why are large, centralized eradication campaigns against the Red-billed Quelea often impractical?
speciesbirdendangeredwildlifequelea