Hernandez Romero showed signs of “blows to different parts of his body and a head injury caused ... Both men were active in the protection of the monarch butterfly and worked in conservation ...

Monarch butterflies are making their annual journey north out of Mexico to their summer breeding grounds. See where they've been spotted in Oklahoma.

In a turn of events, the eastern monarch butterfly population — which was put on the list of endangered species just a few years ago — nearly doubled this year, according to a March report ...