Surprise Discovery Shows Blue Whales Have Been Mating With Another Species

<img width="600" height="243" src="https://www.sciencealert.com/images/2019-11/processed/bluewhaleheart_600.jpg" alt=""/>
Their DNA reveals a hidden secret.

https://www.sciencealert.com/surprise-discovery-shows-blue-whales-have-been-mating-with-another-species