The natural phenomenon of the iconic monarch butterflies migrating south for the winter is a fascinating one - and it's one ...

Copyright 2025 The Associated Press. All Rights Reserved. A butterfly sits on a leaf at Monarch Grove Sanctuary in Pacific ...

We know small populations are especially vulnerable to environmental fluctuations, and we think that’s what happened this ...

A 2,000-mile migration was thought to be a “foolish ... the USFWS issued a December 2024 proposal to list the monarch butterfly as a threatened species under the Endangered Species Act.

Fewer-than-usual monarch butterflies migrated through ... Pismo Beach’s butterfly count matches migration data from the rest of the West Coast. Only 9,119 butterflies were counted at West ...

The findings challenge previous assumptions about butterfly migration and highlight the role of phenotypic plasticity.

MADISON, Wis. — The number of monarch butterflies spending the winter in the western United States has dropped to its second-lowest mark in nearly three decades as pesticides, diminishing ...

The migration of monarch butterflies ... The USFWS proposed in December 2024 that the monarch butterfly be listed as a threatened species under the US Endangered Species Act, with a 90-day ...

Painted lady butterflies are world travelers. The ones we encounter in Europe fly from Africa to Sweden, ultimately returning ...

In 2023, more than 16,000 butterflies were counted at one local grove. The most recent count was a tiny fraction of that.