Both sexes for certain creatures

In SN1 every creature had one variant. Adding basically just a reskin to a creature would make the game more diverse and would make the background lore for certain species more interesting (like ducks are white, but mallards have green heads). There would be no difference in game between them, just their reskin.
For example:
Fish1 has only one variant
Fish2 has both sexes variant, 50/50 if it is male or female
Fish3 is the same, but it is 90/10 ratio for either ∗∗∗

This could also make creature eggs, creature containment, and overall HAVING fish more interesting with extra changes. Maybe you could make a superfish that can fight for you? Maybe do what the US did to chickens and breed a fish with loads of resources to harvest. Fish are morre than just “scary things that could kill you or are meant to be eaten” yknow

Sexual dimorphism the fancy term for that.

I like that idea, it’s the small things that add realism. The difference should be minor though, Like for the stalker you might remove the nasal fins or simply make them grey rather than purple.