The Nyuuna lay their eggs in hidden under water groves of seaweed and kelp. Nyuuna eggs look like dull pearls when they are first laid, but they soon hatch into cute little seahorse-like creatures no bigger than the average human hand.

After hatching, the Nyuuna are curious and very friendly, even towards humans they've never met before. They love to play games and don't seem to have any aggression in them, but if they are threatened, they seem to disappear in a flurry of silt and dust.

The young's preffered food seems to be the silt on the ocean floor, but upon further inspection it's actually the nutrients in the silt they are after.  Day by day, they grow larger and develop grander fins and a longer tail.

Once they've grown into adults, Nyuuna begin to switch their diet to mostly plants along with the occasional fish if they catch it. They also chews coral to wear down their teeth, which are continuously growing. On top of that, they have developed a strong set of lungs and can now spend a good deal of time above water.

They are still as playful and curious as their younger selves, but they are a bit more wary of strangers.

They are extremely swift swimmers now and their vision is much better than when they were younger, though it's still not the best in the world.  Their hearing is tremendously good and though they can identify things clearly with echolocation (much like a dolphin), they prefer to nudge and nibble things they are investigating.

Though small, the Nyuuna is an impressively well-adapted creature and often can be found with intricate and bright colorations. Their colors tend to depend upon the tropical fish they like to play with, but sometimes their colors seem to develop on a purely random basis. It's thought that each Nyuuna might have a seperate color preference of their own, though it hasn't been proven.