Not only do they maintain their niche of the food chain but they are a tourist attraction in many places.
nothing eats alive blue whales
Both. Whale blubber and oil can make useful objects. Whales are also vicious creatures. 40% of humans are killed by whales a year.
How many killer whales were alive ten years ago?
No
Blue whales.
They are useful for sharks, seals or other animals to eat.
Whales are the largest mammal on Earth. ^ So, yes.
2
There are not many killer whales left there are in danger so there are not that many left
Vikings killed whales for food, whale oil, ribs and other useful products.
It is not possible.
Whales, porpoises and dolphins.