Have you see whales in your entire life? Whale is the biggest mamal in the world. I have never seen the whales so I surveyed the biggest whales in the world call blue whales. The blue whale is a marine mammal belonging to the baleen whales . It is up to 29.9 metres in length and with a maximum recorded weight of 173 tonnes and probably reaching over 181 tonnes according to the record,which is much heaveir than car. It is the largest animal known to have ever existed. Blue whales were abundant in nearly all the oceans. For over a century, they were hunted almost to extinction by whalers until protected by the international community in 1966. It is the sad fact that human drove them to the extenction because of their wealthy.Although we have a duty to protect them, We have a duty to proct them.