Which of these is a medium-sized marine mammal, one of four living species of the order Sirenia?

777, The picture is of a Dolphin.

Bonnie , What's ridiculous about this question? Dugongs and manatees are believed to have inspired stories about mermaids/sirens. For players who know this, the word Sirenia in the clue is a giveaway. Did you mean the question was too easy?

Syn, that's to confuse you

Bonnie , It's is not ridiculous to lear about

ChewyGazelle68623, They ar quite ugly. Although harmless

A picture would have been nice.

they are beautiful creatures, I think!!