A new study reveals that baleen whales, including humpbacks and gray whales, enrich oceans when they take a whizz.

Now we can add whale urine to that list, according to a paper published in the journal Nature Communications. “Lots of people think of plants as the lungs of the planet, taking in carbon dioxide, and expelling oxygen,

The study focused on a handful of baleen species — namely, gray whales, humpback whales and right whales — which display “traditional migratory patterns,” moving from colder waters in the summer to warmer waters in the winter. For example, humpbacks in the North Pacific migrate annually from the Gulf of Alaska to the coast of Hawaii.