All these people and animals are yawning. Everybody yawns:
babies,children, very old people and some animals too. Why do we
yawn? Bigmystery.
Yawning is involuntary and contagious. You yawn in class
and yourclassmates will yawn to.We yawn when we are tired or bored,
we yawn when we are nervous.But some animals yawn to threaten their
enemies, for eample !harles"arwin, in his boo# the epression of the
emotions in man and animals,mentions that baboons yawn to show
their teeth to their enemies.
