Pelicans

One day, all the pelicans vanished.
In their place, neatly-typed sheets of paper explained in perfect French how there was a serious design flaw with pelicans necessitating an immediate recall of all pelicans.
Those that could not be upgraded to meet basic safety standards would be replaced or compensated for at fair market value.
Unsigned. Undated.
The next day, pelicans reappeared.
Nobody could explain exactly what had happened.
Was it an elaborate prank by aliens?
Proof of the existence of God?
Why was the note in French?
But most importantly, why pelicans?
I still can’t tell what’s changed about them.