More secret eyesights for mobs in spectator

Some mobs, like Creepers, Spiders and Endermen, have a special sight effect, which is visible only when clicking certain mob in spectator mode. So my suggestion is, adding more of these easter eggs. For example, the Warden, being blind, could have an echolocation effect given by mobs or the player, dogs could see in black and white, cats during nighttime could have a better sight, like Cats in real life, and so on.