Why are male Seahorses the ones that ‘give birth’ to the offspring?

Question

Title, basically. Females are the ones that give birth, or are there more exceptions like the seahorse?

In: 2

Answer 1

Female animals produce eggs (the larger sex cell, via a process called oogenesis). Males produce sperm (the much smaller sex cell, via spermatogenesis). Generally the evolutionary game plan is to have the little sperm to travel to the larger less mobile egg, hence female incubation being the norm. But it’s not a requirement.

In many aquatic creatures, for example salmon or jellyfish, the females and males both just release eggs/sperm into the environment together. There’s no proper internal incubation or even sex involved.