This is a large black bird. It is difficult to identify some of the precise kinds of birds mentioned in this passage. However, they were all birds that preferred to live in places where there were no people, so they symbolize deserted places.
This speaks of Yahweh as if he were a careful builder as he causes destruction in Edom. Alternate translation: "Yahweh will measure that land carefully; he will measure it to to decide where to cause ruin and destruction" (See: [[rc://en/ta/man/jit/figs-metaphor]])