Seriously. They evolved as some of the first life on Earth, and appear to be a species which will outsurvive most of the other species. Overfishing has decreased species which compete with them for food, and their natural predators are being killed off. Millions of them being sucked into cooling systems of nuclear power plants can shut them down. One species can cause death within 4 minutes. One species is essentially immortal. But luckily, we can eat them!
This is a book review, which tells all about it:
It's rather horrifying, but it's encouraging to me that life will continue to thrive even if we continue to destroy the planet. They are such amazing creatures. Maybe they'll evolve into another set of intelligent species.