None. Its possible for bald eagles to swallow smaller birds. But it does not happen on occasion.
Nah, you're thinking of zoologists.
yes
No.
the bird who walk on swallow water are called wadding birds
it depends
Swallow
yes!
Because very few birds can swallow liquid - the have to let it trickle down their throats after they get it in their mouths.
yes they do
no
cliff swallow
No, they swallow their food whole, and because they are birds and birds don't have teeth
Birds eat worms by pecking at the grass and then when finding their food, they fly to their nest to feed their young or probably just eat privately.
It is probably because birds don't chew their food, they swallow it hole, like their dinosaur ancestors.