Mobs having a idle like they do in Minecraft Dungeons

In MCD(Minecraft Dungeons) most mobs idle(vexes and cave spiders do a backflip, skeletons spin their heads, sheep jump happily ect...) from time to time, it would be really great if they did the same in Minecraft. The idle poses also look pretty "Vanilla" for me. Mobs would idle when they are not targeting a player or another mob. Also, some mobs that idle in MCD won't do that in MC because they would need to move significantly (Ex: Ghasts fly very high and then come back) and it would break the game.

*Please, this is not a very important feature, don' t take this to seriously* 

the topics are: parity, mobs, animals and humanoids