Monarch Butterflies 101

Monarch Butterflies 101:

Explore the incredible life and journey of monarchs and their cultural significance as symbols of transformation and resilience.

It’s that time of year again… the great monarch migration!

Each fall, North American monarch butterflies embark on an incredible migration from their summer breeding grounds to their overwintering locations. The Rocky Mountains serve as a natural dividing line with both eastern and western monarchs passing through Colorado in September and early October.

Monarchs east of the Rockies travel upwards of 3,000 miles to central Mexico in search of oyamel fir trees, while western monarchs undertake a shorter journey to the California coast. Their thousands-of-miles migration not only showcases their resilience but also highlights their vital role in our ecosystem as pollinators.

This remarkable migration has been observed for centuries, and researchers have found that these phenomenal creatures use the position of the sun to maintain their flight path. Additionally, these monarchs possess an innate magnetic compass that helps them readjust themselves if they become disoriented.

The monarch migration in the fall coincides with the celebration of Día de los Muertos, a cultural celebration where many communities in Mexico honor loved ones who have passed. Monarch butterflies represent the spirits believed to return on the night of November 2nd. Although this connection is well-known in modern Mexican culture, the link between monarchs and souls span centuries and various cultures. Evidence shows that the Mexica people, previously referred to as Aztecs, believed warriors lost in battle would return as butterflies or hummingbirds, while the Purépecha regarded butterflies as the souls of the departed and the spirit of the forest. In modern times, the established connection between monarchs and Día de los Muertos highlights the importance of conservation – not only for the monarchs and their habitats but the cultural traditions they represent.

Ecologically, monarch butterflies are key pollinators in the ecosystem, feeding on nectar from a wide variety of flowers as adults. The abundance of nectar sources is extremely important for optimal pollination and for the migrating monarchs to build fat reserves ahead of their travels. Since pollination occurs while collecting nectar, access to diverse foliage throughout their journey ensures this essential stage of plant reproduction is accomplished. Despite enjoying nectar from various sources, one particular plant is imperative for the survival and reproduction of the monarch butterfly: the milkweed plant.

A vital component of their life cycle is the milkweed plant, which provides monarchs with both food and a breeding ground. Monarch butterflies exclusively lay their eggs on milkweed plants because, as caterpillars, they can only eat milkweed leaves. Monarch butterflies lay their eggs on the underside of milkweed leaves, ensuring that their young have immediate access to food and shelter. This relationship exemplifies coevolution, as the milky latex of milkweed contains cardiac glycosides, which are toxic to most animals, including humans. Their resistance to cardiac glycosides, alongside their vibrant coloration, serves as chemical and visual cues to warn predators of their toxicity.

Unfortunately, urban planning, agricultural expansion, and other environmental factors have significantly decreased the prevalence of native milkweeds and have impacted monarch butterfly populations. Recent data indicates that eastern monarch butterfly colonies in central Mexico inhabited 59% fewer acres than previously observed during the 2023-2024 winter season, underscoring the urgent need for conservation efforts.

What you can do:
You can play a vital role in supporting monarch populations! Educating yourself and others about monarchs helps foster appreciation for their conservation. By planting native milkweed species or nectar plants that bloom around October in your garden or community spaces, you can create safe havens for monarchs to lay their eggs and re-fuel. Reducing pesticide use, joining local monarch conservation efforts, or advocating to protect natural landscapes also contributes to the survival of these magnificent butterflies.

As we watch these iconic invertebrates take to the skies, let’s celebrate their journey and cultural contributions while protecting their future. Together, we can ensure that the magic of monarchs continues to grace our world for generations to come! Learn more about their inspiring journey at https://butterflies.org/monarch-magic.

Written by: Jenna Springberg