iAn intact ostrich egg is hard to open with a beak. In East Africa, Egyptian vultures have been observed picking up stones in their bills and throwing them at the shell. The stone delivers the blow; the bird can feed once the shell breaks.
iiAn intact ostrich egg is hard to open with a beak. In East Africa, Egyptian vultures have been observed picking up stones in their bills and throwing them at the shell. The stone delivers the blow; the bird can feed once the shell breaks.