The monarch butterfly is a beautiful and colorful creature, but it takes time to reach this stage of its adult life. Understanding a few facts about the process lets you observe it in nature with ease ...

One of California’s most iconic animals is in trouble. A preliminary tally of monarch butterflies that spend the winter along ...

The number of monarch butterflies spending the winter in the western United States has dropped to its second-lowest mark in nearly three decades as pesticides, diminishing habitat and climate change ...

Professor Elizabeth Crone, Department of Evolution and Ecology, checks a non-native milkweed in the San Francisco Bay Area for monarch butterfly eggs and caterpillars. Known for long-distance ...

Monarch butterflies from the western United States have arrived in Santa Cruz and other parts of the California Coast, clumping in the thousands on branches of Monterey pine, coastal redwoods and ...