niche

Everyone has a favorite, some are more niche than others. Inspired by @Teclisrex and a discussion about iberian pigs, I wanted to ask everyone: What niche and unlikely animal do you hope would get into the game some day? And what kind of packs, if any, could contain your niche favorites?

So I've been thinking, which real life habitats can't be made using any animal currently in the game? The only thing I could think of was the Sea lion, and Gibbon but there may be more. What I mean is, for example, a Proboscis habitat could work for any macaque/langur from SEA, so that niche...