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I was out looking at the apple tree today to see if I have any fruit forming yet. not this year it seems, but then I find a caterpillar sitting on a leaf, and it looks like it's floating on it.
What type of caterpillar is this?
It seems like a young swallowtail caterpillar. Many swallowtail species share that "white arrow" bird-dropping stage. It should turn flashier in a few days.
I've only ever seen them on citrus trees, though.
Required, but never shown