Cause and Effect Question

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If there were a beauty contest for insects, butterflies would win by a landslide. Most butterflies live for only a few weeks in their glamorous, winged stage of life. Most of their lifespan is spent in other stages: egg, caterpillar, chrysalis, then adult (with wings).

The female lays her eggs on a plant for a good reason. The caterpillar that hatches from the egg uses the plant as food, eating almost enough for a lifetime. During the chrysalis stage, the caterpillar transforms into an adult. This transformation is called metamorphosis. Then, the adult butterfly feeds on fruits or the nectar of flowers.

But butterflies and their caterpillars can't eat just any plant. Many are very picky.
They must eat whatever plants have evolved along with them in their own neighborhoods. There are over 45,000 species of butterflies. Each species evolved eating the flowering plants that grew in their own neighborhoods. Over tens of millions of years, the butterflies and their favorite plants have lived happily together.

But then people came along and mixed up the plants. They brought new plants from other parts of the world and planted them as crops or gardens or road landscaping. Some of these plants grew so well that they started to choke out the native plants. Lots of native plants got bulldozed away so people could build houses or shopping malls or ball parks. Even in the city parks and gardens, the green lawns and flowers and trees were not natives. Trees and flowers growing in California may have evolved in Africa or Australia!

But, alas, many of the native butterflies couldn't eat these foreign plants. And the ones they could eat were getting harder to find. So their populations dwindled. Actually, 90% of insect species can eat only the plants that are native to their own regions.

But we can help them! You can plant a butterfly garden. It is just a matter of finding out what plants used to grow in your own back yard before people came. You may be able to find a book or website describing the native plants of your location. Then, find a nursery or website that sells the seeds or the plants. You will need nectar plants for the adult butterflies and host plants for the caterpillars.

For example, many species of adult butterflies feed on the nectar of milkweed flowers. But, only monarch caterpillars can eat the milkweed plant itself. Milkweed is common and widespread, so monarch butterflies are widespread as well.

Make a garden of your local butterflies' favorite foods and you will have a beautiful garden of flowers and butterflies. And don't cut off those flowers when they look dead. Leave them alone so they can turn into seeds or berries to feed the native birds. Your garden will help the butterflies and the plants and the birds to continue to live happily ever after.

Grade 7 Cause and Effect CCSS: CCRA.R.3, RI.7.3, RST.6-8.3

What is the main reason butterflies are struggling to survive in some parts of the country?

They cannot find enough butterfly gardens near them.
People have brought in new plants and removed native species.
Many of the species are unable to migrate when and where they need to.
They are losing the seeds and berries they eat to many of the local birds.

Question Info

Cause and Effect Question

Grade 7 Cause and Effect CCSS: CCRA.R.3, RI.7.3, RST.6-8.3