Overhunting during the 1920s and 1930s led these majestic giants to abandon their ancestral waters in Argentina.
![](https://d1mnxluw9mpf9w.cloudfront.net/media/1457/birds.jpg)
Despite being recognised on the IUCN Red List as "Endangered", there are estimated to be 50,000 sei whales in a global population that is trending up.