Monarch butterflies are important pollinators, but their global population is falling.
In California, an organisation found that there were very few monarch butterflies visiting during this 2018 winter. There was an 86% fall in the number of butterflies that they saw. Around the world, the population for all butterflies fell by 0.05 percent. Scientists think that habitat loss and pesticides probably caused this. By fixing these problems and doing more conservation work, people can help the butterflies

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