Answer 1:
yes when they sleep
Answer 2:
Answer #1 is a myth. Ostriches have never been documented to ever stick their heads in the sand either when sleeping or when frightened. How are they going to breathe if their heads are in the sand when they sleep? Let alone be able to hear any predators sneaking up on them. You can't hear very well when you have your head in the sand in comparison with having it tucked under your wing.
So the answer to the original question is: they don't.
Neither ostriches, or flamingos bury their head in the sand.
Ostriches do not actually bury their heads in the sand. This is a myth. Ostriches lower their heads to the ground to eat or inspect something, but they do not bury their heads in the sand as a form of hiding or defense.
Ostriches do not actually bury their heads in the sand. This is a myth. Ostriches may lower their heads to the ground to eat or inspect something, but they do not bury their heads in the sand out of fear or to hide.
No, ostriches do not actually bury their heads in the sand. This is a myth. Ostriches may lower their heads to the ground to eat or inspect something, but they do not bury their heads in the sand as a form of hiding or defense.
Ostriches do not actually bury their heads in the sand. This is a myth. Ostriches may lower their heads to the ground to eat or inspect something, but they do not bury their heads in the sand out of fear or to hide from danger.
No, ostriches do not actually bury their heads in the sand. This is a myth. Ostriches may lower their heads to the ground to eat or inspect something, but they do not bury their heads in the sand as a form of hiding or defense.
No, ostriches do not actually bury their heads in the sand. This is a myth. Ostriches may lower their heads to the ground to eat or inspect something, but they do not bury their heads in the sand as a form of hiding or defense.
No, ostriches do not actually bury their heads in the sand as a defense mechanism. This is a myth. Ostriches may lower their heads to the ground to eat or inspect something, but they do not bury their heads in the sand when they feel threatened.
No, ostriches do not actually hide their heads in the sand as a defense mechanism. This is a myth. Ostriches may lower their heads to the ground to eat or inspect something, but they do not bury their heads in the sand when they feel threatened.
No, ostriches do not actually bury their heads in the sand as a defense mechanism. This is a myth. Ostriches may lower their heads to the ground to eat or to check their nests, but they do not bury their heads in the sand when they feel threatened.
Ostriches do not actually bury their heads in the sand. This is a myth. Ostriches lower their heads to the ground to eat or inspect something, but they do not bury their heads.
The idea that ostriches bury their heads in the sand is a myth. Ostriches do not actually bury their heads in the sand. This misconception may have originated from the fact that ostriches sometimes lower their heads to the ground to eat or to check their eggs in nests. The myth of ostriches burying their heads in the sand is often used as a metaphor for avoiding problems or ignoring reality.