It has been found that the Monarch butterfly, which is the official Texas State Insect, has started its winter migration to Mexico.

As per records, population of Monarch butterflies has been falling in recent years. As per the records, the Monarch's number has gone down to almost 30 million, which was around a billion in 1997.

Experts said that loss of habitat can be a factor behind the Monarch's decline. They affirmed that especially the loss of milkweed, a wild plant that is very necessary for the Monarch's life cycle, is the main cause for lowering population of Monarch butterflies.

A study published by Tyler Flockhart also mentioned about the importance of milkweed in Monarch's life cycle. The study also highlighted that urban spread and high use of herbicide glyphosate, i. e. RoundUp, are the key reason for loss of milkweed across the nation.

Jason Bittel, in an article, gave a simple solution about the problem associated with Monarch butterflies. He said one should adopt every possible effort to plant milkweeds as they are very necessary for the butterfly. In his solution he mentions to use seed bombs for butterflies.

There are almost 73 species of milkweed native to North America. These weeds despite several difficulties have any how managed to survive.

Milkweeds are not only required for laying eggs and for larva stages of the Monarch but the butterfly also enjoys all kinds of wildflowers as food.

It has been found that Monarch starts leaving Canada and the US at time when temperature begins to fall below 60 degrees. They spend their winters in Mexico and again fly towards the north in the spring season. And while their flight towards the north the female Monarch butterflies lay their eggs on the milkweeds.

In addition, when the eggs hatch and the larva becomes butterfly, Monarch butterflies re-colonize their parents' original homes.