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Monarchs start as tiny stripped caterpillars so small you can barley see them on the milkweed plants they feed on. They go through five instars or growth phases while they are caterpillars gong from as small as 2mm to as big as 45mm during the 2 weeks they are in the caterpillar stage. This caterpillar is nearing the end of this phase of its life and will soon move away from the milkweed to attach itself to something and go into it's chrysalis phase.
Monarchs can be found all over the US and into Canada and Mexico. This one is living in my urban garden on the milkweed I've planted to encourage Monarch reproduction.
I'm giddy to report that I think this is the first PN spotting of Monarch poop! (Bug poop is actually called frass). I was watching this caterpillar eating milkweed leaves and saw her/him poop twice!