Do Marine Mammals Yawn and More Questions From Our Readers.

Among marine mammals, pinnipeds, such as seals, do—but cetaceans, such as whales and dolphins, do not.

https://www.smithsonianmag.com/smithsonian-institution/marine-mammals-yawn-more-questions-readers-180969354/

Posted on June 28, 2018 10:27 AM by biohexx1