The researchers, alongside citizen science projects, have been trying to decode the butterfly travel map. Their interdisciplinary ... some took a long migration trip south from Scandinavia ...

An interactive map tracks their migration and shows how close they ... hollyhocks, dianthus and butterfly bush, among others. The typical backyard hummingbird feeder is filled with sugar water.

In the Yukon, Porcupine caribou travel 3,000 miles. This is the longest migration by land of any mammal on Earth. Monarch butterflies fly about 3,000 miles each year. Some will travel all the way ...