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[–]LilianH 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

I would argue that none of these creatures get pregnant because they do not gestate the young within their body. The seahorse holds eggs in a pouch until they hatch and the other two carry around eggs externally until they hatch. If a bird lays eggs in a nest we don't say the nest is pregnant, the same should be true here as well.