Humpback coming out of water

In a mysterious change to their normal behaviour, humpback whales are forming massive groups of up to 200 animals.

https://www.newscientist.com/article/2124149-never-before-seen-gatherings-of-hundreds-of-humpback-whales/?cmpid=SOC%7cNSNS%7c2017-Echobox&utm_campaign=Echobox&utm_medium=Social&utm_source=Twitter