Fun Facts about Killer Whales
* Female killer whales are the leaders of the group, even when they get too old to have babies.
* A growing killer whale baby can put on 1kg every hour and double its size in a week.
* An adult killer whale weighs about 10 tonnes.
* Most of that weigh is muscle - orcas are the fastest swimming mammals.
* Orcas have no natural predators. Deadly sharks are too small compared to their size.
* They are some of the longest-living whales and can live up to 90 years.
* They breed very slowly - they only have a young about every eight years.
* They are some of the few whales that come to the shore - to catch seals and sea lions.
* They play with their prey before killing it, just like a cat plays with a mouse.
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