Currently, in 12.2 and upcoming 1.13, we have a lot of mobs ranging from a chicken all the way up to our ender dragons. Each biome has its own set of mobs and many have unique mobs only occurring in that area. The only biome that I can think of that doesn't have its own mob is the Mesa. Yeah, there is the occasional llama, but those are found in any mountainous areas. With 1.13's new rendition of the ocean, it made me think of this "issue"
I propose we have a unique animal for the Mesa. We could have Kangaroos (My friends and I thought of this together) or red foxes or some mobs that could fit in those areas. We are just sick of an empty mesa and we just want something new xD.
Snakes, foxes and lizards could be great atmospheric mobs, but I doubt they would be too useful. Kangaroos and like fishg suggested, coyotes, would be a much better choice, you'd just have to come up with some sort of utility for them. One idea for kangaroos could be that they could carry smaller mobs perhaps? Like a minecart that follows you without a rail, in a way. As for coyotes, they could maybe be tamed (perhaps even temporarily?) and do something like lead you to the gold-filled abandoned mineshafts or something of the sort.
Do llamas actually spawn in mesa biomes? [I was under the impression they were limited to Extreme Hills and Savanna (base variety only in both cases).]
Given the barren nature of the biomes, having no passive mobs spawn in mesas doesn't seem a bad thing…
If there "just must" be something, adding a reskinned wolf [coyote] that follows the wolf rules for taming etc. seems a fairly low impact way to satisfy the urge.
[Not sure how realistic it would be for this sort of terrain, but the gila mionster might be developed into a useful addition. Possibly limited to the base and plateau avriants because of the difficulties of mobs moving in the more vertical terrain of the others...]
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.