Fish
Seahorse
Hippocampus kuda
About
Seahorses are the only animals in which the male becomes pregnant. The female deposits her eggs into the male's brood pouch, where he fertilizes them and carries them to term.
Their Eggs
Tiny, orange, pear-shaped eggs deposited by the female into the male's ventral brood pouch, where they embed in the pouch wall and receive nutrients.
Egg Size Comparison
Fun Fact
Male seahorses go through actual labor contractions to give birth, expelling fully formed miniature seahorses from their brood pouch. A single male can give birth to up to 2,000 babies in one session, though most species produce 100–300.