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they use their heads as an echolocator to locate their preys on dark areas
because their whales
Fin whales (Balaenoptera physalus) can dive as deep as 470 m (1540 ft).
Orcas can dive upto a 1,000 feet (304.8m).
The blue whale can dive for 10-20 minutes and dive for 500 metres deep.
They dive deep down under a school of fish, then jumps out of the water with its mouth open.
Its density increases.
Because of the whale's CO2 tolerant blood and because of lactic acid fermentation, whales (like the sperm whale) are able to dive down deep to eat deep sea squid and fish. Scource: I'm learning this at one of the best high schools in the USA
Whales dive to get food. They come back to the surface to breathe.
No. Benthic creatures live on the bottom of the ocean. Whales, which have to breath air, may dive deep to feed near the ocean bottom, but they don't live there.
They really do not need to take shelter from much except humans. For this they just dive deep into the water.
They feed at depths of around 1000 feet in the sea bed. But, they can dive atleast twice this depth. A typical dive lasts 3 to 5 mins. But, they can submerge upto 20 minutes at a time.