Question

sea horse is an example of ?

Answer 1

The question is not which species  seahorse is.  The question is about what it is an example of ...  Something that is characteristic about that animal.

Seahorse is animal (sort of seafish) scientifically classified as of Phylum: Chordata of Family: Syngnathidae and of Genus:  Hippocampus.

Seahorse is an example of an animal, the male of which carries (bears) the unborn child in a pouch, like the females bear the child in mammals.