Monarch Butterflies Under Siege

This year may be one of the worst for the monarch butterfly, experts are reporting. Severe hailstorms in Mexico (one of the monarch’s winter home) followed by fifteen inches of rain has left the population decimated by up to 50 percent this year. Add to that the ongoing issue of habitat destruction, and the future of the monarch begins to look a little shaky.

The monarch population is typically measured by the number of acres of pine trees the butterflies fill in their Mexican wintering habitat. This year, scientists found the smallest area of monarchs overwintering in the 16 years they have been looking–down to 4.7 acres from an average of 18.3 acres.

At the fairy-like weight of a mere .026 oz, these stalwart troopers make the journey from as far as Canada all the way to Mexico–it’s like The Odyssey of the insect world. According to, monarch butterflies cannot survive a long cold winter, unlike most other insects in temperate climates. Instead, they spend the winter in roosting spots–monarchs west of the Rocky Mountains travel to small groves of trees along the California coast, while those east of the Rocky Mountains fly farther south to the forests high in the mountains of Mexico.

No other butterflies migrate like North American monarchs. They travel much farther than all other tropical butterflies, up to three thousand miles. They are the only butterflies to make such a long, round trip migration every year. Amazingly, they fly in masses to the same winter roosts, often to the exact same trees. Part of the problem monarchs are facing is the longevity of the trees within which they roost: Illegal logging in Mexico has destroyed the butterflies’ mountain habitats, while property development in California threatens the eucalyptus trees where they roost there.

In addition to habitat issues and the increasingly severe weather, such as that which the butterflies are facing this year, there has also been a significant increase of planting corn and soybean crops that are genetically engineered to be herbicide-resistant. This allows farmers to use weed killer without hurting the crops, but it also means that little of the monarch’s beloved milkweed is left. No milkweed means no place for the butterflies to breed along the way, a crucial step, obviously, in the survival of the species.

Visit to find out what you can do to help. For more ways to help butterflies see First Aid for Butterflies, and How to Make Butterfly Food.


William C
William Cabout a year ago


W. C
W. Cabout a year ago

Thank you.

jayasri amma
jayasri amma6 years ago


Jane W.
Jane Warren6 years ago

Milkweed is a noxious weed isn't it? Meaning that it is to be eradicated wherever it is seen.
A shame the legislation stating that didn't think about monarch butterflies.

Alisha L.
Past Member 7 years ago

The life cycle of Monarch Butterflies includes a change of form called complete metamorphosis. The monarch goes through four radically different stages. The four stages of the monarch butterfly life cycle are the egg, the larvae, the pupa, and the adult butterfly. The eggs are laid by the females during spring and summer breeding months.The eggs hatch or after the four days, revealing worm like larvae, the caterpillars. In the pupa or chrysalis stage, the caterpillar spins a silk pad on a twig, leaf, etc and hangs from this pad by its last pair of prolegs.

Ann L.
Ann Lawrence7 years ago

I have raised Monarchs in the past-- and one fall a scientist "tagged" 13 of them before they migrated. Their demise is a great loss to the world-- they are part of the inticate life web. Good article.

Beng Kiat Low
low beng kiat7 years ago


Jessica M.
Jess M7 years ago

I sure hope we can do something to help these sweet, beautiful creatures. I love butterflies and where we live we get irrigation and we have seen quite a few monarchs! I get wide-eyed excited with each one I see. SAVE THE BUTTERFLIES!!!

Antoinette Reyes
Antoinette R7 years ago

aww thats a shame

Alison Baker
Alison Baker7 years ago

Destroying the forests & wildlife habitats make room for the drug industry. Much for lucrative. Fools!