Species Loss

Monarch Butterflies

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Data Source

Brower, L.P. et al., Decline of monarch butterflies overwintering in Mexico: is the migratory phenomenon at risk? Insect Conservation and Diversity (2012), 5, 95-100. [1994-2011]

Rendon-Salinas, E. et al. Area of Forest Occupied by the Colonies of Monarch Butterflies in Mexico During the 2022-2023 Overwintering Period. [2012-2023]

Monarch Butterfly Numbers Are Down Sharply at Wintering Areas in Mexico by Catrin Einhorn for 2023-24. Last updated 2024/02/08

More Information

Video

Migratory monarch butterfly now Endangered - IUCN Red List (2022/07/27)

Fireflies

Are Fireflies Disappearing? Farmers' Almanac (2021/02/08)

North American Birds

Three billion North American birds have vanished since 1970 Science (2019/09/19)

Polar Bears

Are Polar Bears Endangered? Polar Bears International

Other Endangered Species

Endangered Species U.S. Fish & Wildlife Service