Sperm whales have the heaviest brain for any animal.

It can weigh more than 9 K.G. (20 lbs). This is 6 times larger than a human brain.

A fully grown sperm whale can weigh 50 tonnes and be 20 meter ( 66 feet) long.

The head of the whale is about one third of the body length and contains up to

500 gallons ( 2300 liters) of pure oil.

Until the time of the refined mineral oils, this was the finest lubricant known to man.

It was wrongly believed that the oil was the sperm of the whale and hence the misnomer as the sperm whale.