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Monarchs are well known for their prodigious migrations in North America, however this one is almost certainly a Costa Rican resident where their foodplant (Tropical Milkweed) grows in abundance all year round, so it doesn't need to migrate. By feeding on this plant the caterpillar builds up a reservoir of toxicity, which is carried over into the adult insect, rendering it unpleasant to eat by predatory birds --- thus the butterfly is brightly coloured to advertise this fact. D750 with 105mm nikkor micro + 1.4TC @150mm, ISO 800, f4.2, 1/1000Sec., handheld.