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4 paź 2023 · October 4, 2023. • 9 min read. Just last year, the International Union for Conservation of Nature declared the migratory monarch butterfly endangered, a decision that made headlines around...
8 lut 2024 · In the forests of central Mexico, where eastern monarch butterflies have long wintered, the species were estimated to occupy a mere 0.9 hectares (2.2 acres) during the 2023-2024 winter season.
21 mar 2023 · Date: March 21, 2023. The Eastern migratory monarch butterfly is at risk: new reports show a sharp population decline and a loss of habitat in the forests where they winter each year. In just one year, the presence of monarch butterflies in their wintering grounds dropped 22%, from 7 acres to nearly 5.5. acres.
31 sty 2023 · The population of western monarch butterflies reached its highest numbers since the year 2000, with more than 335,000 butterflies counted at their California and Arizona overwintering sites during ...
21 lip 2022 · Gland, Switzerland, 21 July 2022 (IUCN) – The migratory monarch butterfly (Danaus plexippus plexippus), known for its spectacular annual journey of up to 4,000 kilometres across the Americas, has entered the IUCN Red List of Threatened SpeciesTM as Endangered, threatened by habitat destruction and climate change.
22 mar 2023 · The latest results reported by World Wildlife Fund-Mexico of the annual survey of eastern monarchs overwintering in central Mexico found the butterflies occupied an estimated 2.1 hectares of forest during the winter of 2022–23. This reflects a decline of approximately 22 percent compared to the previous winter, when monarchs occupied 2.8 ...
11 wrz 2023 · Over the 10-day period of the 2023 Blitz, 1,789 individuals, across Canada, Mexico and the United States, monitored more than 40,000 milkweed stems and reported seeing more than 13,000 monarchs, all stages combined.
