What is wrong with creature unlocks

I have been noticing a pattern of only unlocks for spino,ostafrikasaurous,micro and kapro …ludia there are a lot of locked creatures so please have some other creatures also

This question had been asked and answered quite a lot of times on the Forum earlier. In any case, I’m linking this post here:

For a detailed analysis of the base rarities refer to this thread: Jurassic Base Creatures Listed : In and Not In Rotation

After this of course comes the Amber updates.