I said this once already in the niche discord server, but visual differences on the horn genes as Nichelings grow! Not including when Nichelings grow old but not starting out with full grown horns (I'm looking at you megaloceros horns.)
Concept drawing. Plus, if put this way, babies on blind gene mode can be more interesting. Did they get horns or did they not? Gotta wait until they're a child to find out! And until a teen for what kind of horns specifically!
Just noticed that Hehak mentioned something similar, last post on the second page