This little flock of birds are the straw-necked Ibises flying from meadow to meadow.
They are cleaners.

The Straw-necked Ibises are often called the Farmer's Friend,
because they feed on pests that would otherwise eat farm crops.
On land, they thrive on grasshoppers, crickets, and locusts.
They also eat small lizards, skinks, and other small reptiles.