Male seahorses have a clear agenda when it comes to selecting a mating partner: to increase their reproductive success. By being choosy and preferring large females, they are likely to have more and bigger eggs, as well as bigger offspring, according to Beat Mattle and Tony Wilson from the Zoological Museum at the University of Zurich in Switzerland. Their findings1 have just been published online in Springer’s journal Behavioral Ecology and Sociobiology.

Male seahorses are nature’s real-life Mr. Moms – they take fathering to a whole new level: Pregnancy.