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Monarch Butterfly (Danaus plexippus)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Monarch Butterfly



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The king of the North American Butterflies is the Monarch and its reigns may be ending as its food availability dwindles along its migration route.



Updated: 09/21/2020; Authored By Staff Writer; Content ©www.InsectIdentification.org
Monarch Butterflies are a becoming a less common sight throughout North America. According to the Center for Biodiversity in Tucson, Arizona, their numbers have dropped almost 80% over the past 20 years. While cold temperatures in the summer made them rare in the extreme northern regions, a variety of factors is responsible for their diminishing numbers in the southern provinces and states. Natural disasters, like the wildfires that have ravaged California, destroy vegetation that the Monarch needs for rest and nourishment. As of 2019, these western populations are on the verge of collapse. Rapid development of their habitat across the rest of the U.S. and Canada removes food plants, making it harder to find places that will support the next brood, let alone the next generation. The use of pesticides on agricultural fields also kills the butterfly as it crosses continents. Climate change leading to hotter winters in Mexico, where the species overwinters, is drying out and killing the trees the butterfly depends on. The declining numbers of the Monarch led to an assessment for their protection under the Endangered Species Act in the United States. A decision on whether or not to list the Monarch as endangered was expected in June of 2019, but was then extended to December 2020.

Monarch Butterflies are migratory. They live in the northern region of the continent during the summer and then fly south to warmer regions to live during the winter months. A single Monarch can cover thousands of miles of flight in one season. Millions of this large butterfly fly together to the southern U.S. states and Mexico to avoid the bitter cold winters of Canada and the northern U.S.. In the spring and summer, legions of them travel back north in waves, or pulses. Their arrival in many towns is celebrated, and now citizens help scientists by documenting and sharing data like local population counts (or good estimates), dates of arrival and departure, and geographic location. This invaluable information has helped bring to light the dire situation that Monarchs are now facing. It may also help in reviving the butterfly's dwindling numbers.

The mascot of many organizations, the orange and black Monarch is likely very familiar, even if never before seen in real life. Photos and drawings of it are easy to find online. A black border around the wings has rows of tiny white dots. The hairy black body sports a few tiny white dots on its head and 'neck', and small white dashes on both sides of the black abdomen. Colors begin to pale as the butterfly becomes weathered. The related Viceroy Butterfly looks similar to the Monarch Butterfly, but has slight differences in both pattern and color. A discerning eye should be able to tell the two apart.

Monarchs tend to gravitate towards open meadows or along the road, traversing the terrain in the search for the much favored milkweed plant. They are active from May to early fall in most areas, but year-round in Mexico, Florida, Hawaii, and Texas. Like all butterflies, the Monarch begins as a caterpillar, feeding on foliage and flower buds where available. It is black with white and yellow rings from head to tail. Growing its favorite plant to eat - any variety of milkweed - is a great way to help support this species locally. Grow plants in the Asclepias genus (Milkweed's scientific genus); ask for them by name at your local plant nursery, or order seeds online. To learn more about what you can do to help Monarch butterflies in your country, visit these resources:

in the U.S.: United States' Save the Monarch campaign
in Canada: Canada's Save the Monarch campaign
en M?xico: WWF-M?xico: Mariposas Monarca y Protejamos a las monarca




Known Diet of the Monarch-Butterfly



milkweed foliage, flower buds


General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
Flying insect icon




Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Lepidoptera
        Family: Danaidae
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          Genus: Danaus
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            Species: plexippus
Identifying Information
Size, Colors, Features
Scientific Name: Danaus plexippus
Other Name(s): King Billy Butterfly
Category: Butterfly or Moth
Size (Adult; Length): 89mm to 105mm (3.50" to 4.13")
Colorwheel Graphic Colors: orange; black; white
Descriptors: flying

Monarch-Butterfly Video(s)




Monarchs taking lantana nectar.
Monarch caterpillar nibbling on milkweed.
Relative Size Comparison
Typical Range Between 89mm and 105mm
Lo: 89mm
Md: 97mm
Hi: 105mm
Territorial Map*
U.S., Canada, and Mexico
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Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Alaska  
Hawaii  
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Monarch Butterfly may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Monarch Butterfly. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.

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