Butterfly populations in the US shrank by more than a fifth within the space of two decades, according to a new study. Numbers fell by 22% between 2000 and 2020, according to research by Binghamton University in New York. A third of species saw serious decline, with some, like Julia’s Skipper, losing more than 90% of their populations. However, the researchers say butterflies may be able to recover if urgent conservation measures are taken.
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