Your answer can be ANY marine mammal, alive or extinct. Adding a picture would be awesome, too! My favorite marine mammal is the otter!
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Sea otters. So darn cute.
Seals and sea lions.
Paquita dolphin
Blue whales
Mermaids ( You didn't say it had to be real)
Dugong, aka sea cow as it is the only marine herbivorous mammals, depending largely on seagrass for food. In the chain of evolution, dugong are more closely related to elephants than to other sea mammals.
Here is a link to Dugong photos and facts : https://a-z-animals.com/blog/incredible-dugong-facts/
Here is a Picture qZ7VHqy-67...ab0842.jpg
Do penguins count? I think it's hard not to smile when you see them waddling around.
Harbor seals. They're little clowns. Once when my son was 2-3 we went to the SF Aquarium. They had a big tank with dolphins and harbor seals, and a glass wall for viewing. One seal played peekaboo with my son for the whole time we were there.
