do they know which way to go?
One of the great mysteries surrounding monarch migration
is how the butterflies navigate to their winter home in Mexico. Last
week, scientists announced a suprising discovery: the monarchs' antennae
are involved in orientation. How did the scientists make their discovery?
They carefully dipped the monarchs' antennae in paint! Some butterflies'
antennae were dipped in black paint
and others in clear paint.