Whales are the largest animals one earth they are mammals
What hunt for food using a variety of techniques and not all
species of whale will hunt for or attack their prey in the same way.
The way it works is as they their prey they send out a series of clicking and busing noises, these clicking and busing sounds bounce off of objects in the area (such as fish or other aquatic lifeforms) and return back to the whale indicating information such as how far objects are, what type of texture it is (hard or soft), and whether or not the object is moving or still.
Unlike most animals, whales are conscious breathers. All mammals sleep, but whales cannot afford to become unconscious for long because they may drown
Whaling is no longer the only threat to whales. The oceans, or rather, human impacts on the oceans, have changed dramatically over the half-century since whales have been protected.
Known environmental threats to whales include global warming, pollution, overfishing, ozone depletion, noise such as sonar weaponry, and ship strikes. Industrial fishing threatens the food supply of whales and also puts whales at risk of entanglement in fishing gear.