Whales ever lived on this planet, reaching length

Whales are marvelous creatures. The blue whale is the
largest creature that has ever lived on this planet, reaching length up to 30
meters and weighing more than 190 tons. They have been roaming the seas since more
than 25 million years ago and have their roots as far as 200 million years ago,
when it is believed the first mammals developed. As all mammals descend from
land, it is astounding how whales are totally adapted to the sea today and they
are unable to survive on land. Being that they are special creatures in many
ways, it is somber the fact that they have been threatened with extinction by
number of reasons, while some species have made the near extinction list.

 The main reason
whales are facing extinction is humankind. Every year around whales are being
killed by whalers.  The way people
endanger whales is threefold: directly by whale hunting and indirectly by
fishing and polluting their natural habitat, the seas and oceans. Even though
commercial hunting has been limited since 1982, when the International Whaling
Commission set a limit to the whale killing number per annum, there are still many
illegal endeavors, being disguised as hunting for scientific reasons, when it
is purely for commercial reasons and making profits. Whaling has been part of
some nations’ culture for centuries, but as technology has developed over the
years, it is not easier to capture these creatures, hence increasing their
mortality rate. An indirect way humans are involved in whales’ deaths is
fishing. Beaked whales and other marine mammals are unintentionally caught in
fishing nets, mostly in gillnetting and seine netting, significantly causing the
increase of their mortality. Another indirect cause is marine pollution. As each
year the seas become more and more polluted, whales, as other marine animals
are affected, developing cancers, mothers passing toxins when breastfeeding
their young or be poisoned by swallowing waste, such as plastic.  

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