A monarch butterfly sits on the pants of a tourist at El Rosario sanctuary, in El Rosario, in Michoacan state, Mexico February 11, 2021.
Dead monarch butterflies litter the ground at El Rosario sanctuary, in El Rosario, in Michoacan state, Mexico February 11, 2021.
A tourist holds a monarch butterfly as other takes a picture at El Rosario sanctuary, in El Rosario, in Michoacan state, Mexico February 11, 2021.
A monarch butterfly is pictured at El Rosario sanctuary, in El Rosario, in Michoacan state, Mexico February 11, 2021.
A monarch butterfly sits on a branch of a tree at El Rosario sanctuary, in El Rosario, in Michoacan state, Mexico February 11, 2021.
Monarch butterflies sit on a plant at El Rosario sanctuary, in El Rosario, in Michoacan state, Mexico February 11, 2021.
A monarch butterfly sits on a plant at El Rosario sanctuary, in El Rosario, in Michoacan state, Mexico February 11, 2021.
A monarch butterfly sits on a flower at El Rosario sanctuary, in El Rosario, in Michoacan state, Mexico February 11, 2021.
Monarch butterflies sit on the ground at El Rosario sanctuary, in El Rosario, in Michoacan state, Mexico February 11, 2021.
Monarch butterflies rest on a tree at El Rosario sanctuary, in El Rosario, in Michoacan state, Mexico February 11, 2021.
Monarch butterfly population falls in Mexico