What Is a Marine Mammal?
A coastal marine mammal A harbor seal (Phoca vitulina) basking on a harbor rock in Monterey Bay, California. (more) What Is a Marine Mammal? Written by Melissa Petruzzello Melissa Petruzzello (she/her) is Assistant Managing Editor and covers plants, algae, fungi, insects, spiders, renewable energy and environmental engineering. She also handles certain topics in Christianity,... Melissa Petruzzello Fact-checked by Britannica...