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Freebase (0.00 / 0 votes) Rate this definition: Monarch butterfly. The Monarch butterfly is a milkweed butterfly in the family Nymphalidae. It is perhaps the best known of all North American butterflies. Since the 19th century, it has been found in New Zealand, and in Australia since 1871, where it is called the wanderer.
Step 1: Timeline. Below are the dates on which significant events in the life of these Monarch butterflies occurred. The timing may vary, but it will be helpful to know about how long things take. June 28 -- Monarch butterfly observed laying eggs on milkweed. June 30 -- Five eggs brought inside (photos only show four).