Water creatures will spawn in water as unknown submerged creatures and will be unveiled upon encountering them.
Distressed creatures can appear on the map and the player needs to help them or save them to earn a reward.
I’ve seen suggestions for Water-based spawns before. Many users have suggested water-based creatures spawning near or in water on the map, but personally, this seems a bit unfair for those that have no water anywhere near them on the map.
So I present my suggestion:
This would be a new feature and would spawn a creature on the map that is in distress. This could be anything from a Darwinopterus trapped under a heavy branch, to a sick Triceratops GEN 2, to a water-based creature (like Mosasaurus or Ichthyosaurus) that has been beached and needs water (this would allow water-based creatures to spawn on land but in a different way).
Players need to save these creatures by means of a similar minigame to darting (or alternatively using a relevant item) and will earn DNA and perhaps other rewards based on how well they do. In certain instances, it may even be such that sometimes a bleeding and injured Iguanodon is being attacked by a Velociraptor and intervening could provide DNA from both creatures.
I believe that water-based creatures could also spawn in water, but will be submerged and unknown until the drone is launched, so as not to ruin the immersion of a massive Kronosaurus spawning in a swimming pool square on the world map. Keeping with this, the darting mini-game will show a full area of water instead of the map segment that is normally used.
In battle, water-based creatures could be kept afloat in a bubble or in some way by technology, so as to not separate them from other creatures.