Because of their complex life cycles and interdependent relationships with plants, butterflies are especially vulnerable to habitat loss, toxins, invasive species and climate change. Over the past century in the U.S., vast areas of meadow and grassland butterfly habitats have been converted for housing, agriculture and industrial development, leaving many species in isolated pockets. Climate change has also been linked to butterfly population declines, for instance by altering the seasonal availability of host plants on which caterpillars depend.
Why they're in trouble:
How to help Butterflies:
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