THIS MIGHT SURPRISE YOU
The answer
A freshly plucked olive leaf (Genesis 8:11). Noah also sends out a raven first, which the dove is often remembered instead of.
Why it’s interesting
The raven goes out before the dove and simply flies "to and fro" — the dove and its olive leaf became the enduring image of peace, while the raven quietly dropped out of the retellings.
Scholarly consensus
You can know the Bible.
Not just the stories, but the history, authorship, and scholarship behind it.