Innate.
To grasp prey and hold on to branches or perches.
After foraging for food the adults return to the nest and regurgitate the collected food for the young to eat it from their mouths. Not appetizing for a human but it beats starvation.
to eat, or to sing, or to vomit into the mouths of their children
Birds use their tongues to taste, they use their beaks/ mouths to drink.
Birds start brooding behavior the day before hatching.
It prompts the parent bird to feed them.
It depends entirely on what type of bird it is. Some birds perch right on the grass and some live on cliffs with no grass in sight, it really depends what the bird needs.
it means birds
Because very few birds can swallow liquid - the have to let it trickle down their throats after they get it in their mouths.
it is a courtship thing, why do you take your date out to dinner? it's the same thing.
they eat the leftovers of whats between the animals teeth.
All birds that eat fish will carry them in their mouths (that is where birds carry all food they get). There are many, many species of birds that eat fish, so it would be hard to answer your question more specifically.