Answer:
I can travel from there to here by disappearing, and here to there by reappearing.
They're up near the sky, on something very tall. Sometimes they die, only then do they fall.
What bird can lift the heaviest weight?
I can be short and sometimes hot. When displayed, I rarely impress.
White bird, featherless, flying out of paradise. Flying over sea and land. Dying in my hand.
What language does a billboard speak?