The blue whales of California have recovered their numbers almost to pre-whaling levels, [ thanks to lots of protection efforts ]( http://www.theguardian.com/environment/2014/sep/05/blue-whales-return-california-us-west-coast ) . However, globally the blue whale population is only around 2% of what it was 140 years ago.
Ссылка: https://stallman.org/archives/2014-jul-oct.html#06_September_2014_%28Blue_whale_population_recovery%29