Each year, millions of monarch butterflies travel thousands of miles across North America to escape the cold and find ...

The number of monarch butterflies spending winter in the western U.S. dropped dramatically this year, despite moves to extend ...

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

Monarch butterflies in the western U.S. have dropped to just 9,119 this year. In 2023, the count was 233,394, meaning a 96% decline.

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

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

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

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

SIOUX CITY – Monarch butterflies need a helping hand to flourish ... species rely on each other for survival. It discusses the migration monarchs go through from Canada to Mexico,” said ...

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.

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 ...