There are 17,500 species of butterflies in the world. Approximately 550 species can be found in the United States. Butterflies are an important part of nature because they supply food for birds and are pretty pollinators.
Possibly the most well-known species is the Monarch. Those of us of a certain age, can remember a time when monarch butterflies were everywhere. We would go outside with our butterfly nets and chase them all around the yard until we finally caught one.
Did You Know? Aside from their favorite food, milkweed, these are the best flowers to attract butterflies to your yard: dill, blazing star, hibiscus, flowering dogwood, lilac, and parsley, to name a few.
The monarch has a four-stage life cycle: egg, caterpillar, pupa (chrysalis), and adult, which can be five weeks, two to six weeks, or six to nine months. It doesn’t matter which life stage the butterfly is in, when winter comes, it will enter a dormant (hibernative) state similar to mammal hibernation. Butterflies must stay cold and dry while dormant. If disturbed during this state, it might wake up too soon and die. Left undisturbed, most butterflies will hibernate until the beginning of March. Since butterflies in the caterpillar state can only consume certain plants, and it is important that those plants are nearby and are blooming when they wake up so they can begin to eat right away.
Monarchs lay their eggs on the milkweed plant. This plant is its only source of food. The monarch lays only one egg at a time, but over a couple of weeks, she can lay as many as 700 eggs. As you can imagine, the eggs, white and round, are extremely small. The butterfly larva remains in the egg for less than a week. When it “hatches,” it is in the caterpillar stage and remains a caterpillar for two more weeks. During this time, it molts and sheds its skin as many as five times. It also goes through multiple growth spurts and will eat its body weight in milkweed. It grows until it becomes a two-inch long caterpillar. Now it is ready to find a safe, quiet place to form its chrysalis.
The caterpillar forms a small green chrysalis—great camouflage—on a leaf or plant. They remain in the chrysalis for two weeks. You can know when the butterfly is about to emerge when the chrysalis has changed from green to brown.
Did You Know? A butterfly rests with its wings closed, while a moth rests with them spread out. Moths are dull in coloring, but butterflies are vibrant in color. Butterflies are diurnal, and moths are nocturnal.
Finally, the monarch hatches from its chrysalis. Its wings are folded and damp. It takes a little while for them to dry off. Once dry, the female monarch is ready to reproduce. The males need a couple extra days. Their wings are covered in scales and this is what gives them their colorful wings.
When monarchs migrate, it is a long and amazing trip and can consist of as many as five generations of butterflies. Over two months, monarchs will fly approximately 2,000 miles south—a staggering trek—to Mexico and the southern U.S.. This generation lives two to nine months because they spend most of that time flying and hibernating, but this generation is also responsible for the subsequent generations that will keep the life cycle of the monarch going, flying north at the end of winter to lay their eggs.
Sadly, butterflies are decreasing in number—22% in the last 20 years—resulting in the decline of other insects as well.
Sources: birdsandblooms.com/gardening/attracting-butterflies/monarch-migration-magic; ecokidsplanet.co.uk/blogs/news/science-in-the-park-how-do-butterflies-survive-winter; a-z-animals.com/how-long-do-monarch-butterflies-live; activewild.com/difference-between-moth-and-butterfly; usatoday.com/story/news/nation/2025/03/06/us-butterfly-population-decline/81350506007 thespruce.com/plants-for-butterflies-8606986