The Mirage is a visual effect that applies to two objects in the deserts of The Natural World: the Caravan and the Giant Turtle. Like mirages in real life, it's a projection that gets further away when the player approaches it.
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The Caravan Mirage...
Coming Closer to the caravan - will most likely result in it disappearing.
Another Mirage - Giant Turtle Mirage
Coming closer to the Giant Turtle - will result in it becoming small.