Why are male seahorses pregnant?

Answer: Males carry eggs in pouch

Males produce more nutrients — Wrong. Females produce the eggs (with nutrients). Males provide a safe, oxygenated environment in their pouch where eggs develop.

Evolving new reproductive method — Wrong. Male pregnancy is unusual but well-established in seahorses, not currently evolving. The pouch incubates eggs after females deposit them.

Males carry eggs in pouch ✓ — Correct! Female seahorses deposit eggs into the male's brood pouch during mating. The male fertilizes them internally and carries them for 2-4 weeks, providing oxygen and nutrients. When ready, he 'gives birth' by contracting muscles to release hundreds of tiny baby seahorses! True male pregnancy!