what is the biggest animal on the earth?

is an elephant much smller than a blue whale?（少了whale吧）
Yes_____________________
what's your favourite event(event是事件,大事的意思,按照个人回答）
My brother will come to play with me this afternoon
which fish can swim faster than most boats?
The sailfish______________________
how can people move as fast as animals and fish?
By plane_____________________________________