The blue whale is the world’s largest and heaviest existing animal. Hunted almost to extinction by whalers in the 19th century, it is currently endangered, like many other species, by habitat loss due to pollution and climate change. Toxic chemicals and the warming of the ocean disrupt migration and food sources, sonar disrupts whale communication, and whales also collide with ships and become entangled in fishing gear.
Humans have not been kind to whales.
A good, if depressing, compilation of whale and human history can be found in Philip Hoare’s book “The Whale”. My review on goodreads is here: https://www.goodreads.com/review/show/118181104