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2021 was a pivotal year for octopuses, manatees, wolves, and more

Although millions of monarchs used to arrive in California each fall, this year’s tally is still an encouraging sign. It indicates that monarchs, like many insects, can recover quickly under the right conditions. “They lay hundreds of eggs,” Karen Oberhauser, a monarch expert and professor of entomology at the University of Wisconsin Madison, told Vox in December. “Good conditions can lead to quick increases in their numbers.”