This passage from Ennius is preserved in Cicero’s De Divinatione 1.48

“They were struggling over whether the city would be called Roma or Remora.
And worry about which one of them would rule infected all men.
They were awaiting the word as when the consul wishes to give the signal
And all men eagerly look to the wall’s border to see
How soon he will send out the chariots from the painted mouths—
This is the way the people were watching and holding their mouths
For which man the victory would elevate to a great kingdom.
Meanwhile, the white sun receded into the darkness of night.
When suddenly a white light struck the sky with its rays.
At the same time there came flying straight down the most beautiful
Bird from the left and then the golden sun rose.
Three times, four sacred forms of birds descended from the sky
And settled themselves in propitious and noble positions.
In this, Romulus recognized that the first place was granted to him,
A kingdom and place made certain by the signs of birds.”

Certabant urbem Romam Remoramne vocarent.
Omnibus cura viris uter esset induperator.
Expectant vel uti, consul cum mittere signum
Volt, omnes avidi spectant ad carceris oras,
Quam mox emittat pictis e faucibus currus: 90
Sic expectabat populus atque ora tenebat
Rebus, utri magni victoria sit data regni.
Interea sol albus recessit in infera noctis.
Exin candida se radiis dedit icta foras lux.
Et simul ex alto longe pulcherruma praepes 95
Laeva volavit avis: simul aureus exoritur sol.
Cedunt de caelo ter quattor corpora sancta
Avium, praepetibus sese pulchrisque locis dant.
Conspicit inde sibi data Romulus esse priora,
Auspicio regni stabilita scamna locumque.