Underwater photos have solved a marine mystery that had stumped scientists for decades: how the elusive red pipefish carries its eggs. The answer, it turns out, is that the male carries them directly on his trunk. According to Australian Geographic, the red pipefish is a rare Australian relative of seahorses and seadragons, and it is notoriously difficult to spot in the wild. Its thin body and deep red coloring let it blend almost perfectly int…