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Researchers found that butterflies first appeared somewhere in central and western North America 100 million years ago.
See the World Through the Eyes of Animals With These Stunning New Videos, Smart News
At last, butterflies get a bigger, better evolutionary tree – Research News
Fossils reveal butterfly 'tree of life' and origins
All About Butterflies - Cambridge Butterfly Conservatory
Oldest butterfly fossils ever discovered – DW – 01/11/2018
Some Monarch Butterflies Don't Migrate
The Genetics of Butterfly Colors
Researchers: Western monarch butterflies overwintering in California dropped by 30% last year - CBS San Francisco
How Does a Caterpillar Turn into a Butterfly?
Butterflies evolved from moths about 100 million years ago in North America : NPR
Seasonal specialization drives divergent population dynamics in two closely related butterflies