"Fortunately, however, birds don't understand pep talks. Not even St. Francis'. Just imagine, he went on, preaching sermons to perfectly good thrushes and goldfinches and chiff-chaffs! What presumption! Why couldn't he have kept his mouth shut and let the birds preach to him?"

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A bird maintains itself in the air by imperceptible balancing, when near to the mountains or lofty ocean crags; it does this by means of the curves of the winds which as they strike against these projections, being forced to preserve their first impetus bend their straight course towards the sky with divers revolutions, at the beginning of which the birds come to a stop with their wings open, receiving underneath themselves the continual buffetings of the reflex courses of the winds.

— Leonardo da Vinci