Are blue whales extinct?

Question

I heard it was, and then I saw recent video of one.

Answer 1

well you heard wrong.

Answer 2

Nope, but they are an endangered species.

http://www.wildlife.alaska.gov/index.cfm...

http://www.environment.nsw.gov.au/determ...

Answer 3

Your wrong a blue whale. One of the blue whale relative called the Basilosaurus is extinct.

Answer 4

they haven't extinct they are endangered

Due to their enormous size, power and speed, adult Blue Whales have virtually no natural predators. There is however one documented case in National Geographic Magazine of a Blue Whale being attacked by Orcas, although the Orcas were unable to kill the animal outright during their attack, the Blue Whale sustained massive wounds and probably died as a cause of them shortly after the attack.[citation needed]

Blue Whales may be wounded, sometimes fatally, after colliding with ocean vessels as well as becoming trapped or entangled in fishing gear.The ever-increasing amount of ocean noise drowns out the vocalizations produced by whales, which may make it harder for whales to communicate. Human threats to the potential recovery of Blue Whale populations also include accumulation of polychlorinated biphenyl (PCB) chemicals within the whale's body.

With global warming causing glaciers and permafrost to rapidly melt and allowing a large amount of fresh water to flow into the oceans, there are concerns that if the amount of fresh water in the oceans reaches a critical point there will be a disruption in the thermohaline circulation. Considering the Blue Whale's migratory patterns are based on ocean temperature, a disruption in this circulation which moves warm and cold water around the world would be likely to have an effect on their migration. The whales summer in the cool, high latitudes, where they feed in krill-abundant waters; they winter in warmer, low latitudes, where they mate and give birth.

The change in ocean temperature would also affect the Blue Whale’s food supply. The warming trend and decreased salinity levels would cause a significant shift in krill location and abundance.