What meconium that come out of butterflies?

Butterflies do not produce meconium like mammals. Instead, what might be referred to as "butterfly meconium" is actually the excretion of waste from the caterpillar stage, which is expelled after metamorphosis. This waste is typically in the form of frass (caterpillar droppings) and is not related to meconium in the context of mammalian development. Once butterflies emerge from their chrysalises, they focus on feeding and reproduction rather than waste elimination.