Passer means it is a passerine, or perching bird..The Domesticus comes from the close association with humans, using our buildings and homes for nest sites.
The passer is also known as a quarterback (QB)
To pass
Sparrow.
passer la journée is 'to spend the day'
Passer has lots of meaning in French. A most common one is "to go from one location to another"
passer la journée means to spend the day in French.
you meet your soulmate
'passer un examen' means 'to take / to sit an exam' in English. (That doesn't mean that you actually pass it). Regarder is 'to watch, to look at', so regarder passer un examen means 'to look at [someone] taking an exam'
"Passer la langue" is a French expression meaning to run one's tongue over one's lips or lick one's lips, often in anticipation or desire.
Il s'est passé quoi (il c'est passer quoi isn't correct) means 'what happened?' in french.
caca
If their beaks are down in the seeds when they shake their heads, as I suspect you mean, they are trying to uncover their favorite seeds. House Sparrows, for example, are very fond of millet, so when they've eaten all the millet seeds they can see, they move the seeds around to find some more millet.