Monarch butterflies with more white spots on their mostly orange-and-black wings are more successful at long-distance migration. Some scientists think the spots may affect airflow around their wings.

The late morning is clear and warm during my walk. Previous days gave some rain and clouds, and now we have sunshine filtering through the forest trees as I go on my usual woods route. Crossing the ...

Monarch butterflies with more white spots on their mostly orange-and-black wings are more successful at long-distance migration. Some scientists think the spots may affect airflow around their wings.

Monarch butterflies with more white spots on their mostly orange-and-black wings are more successful at long-distance migration. Some scientists think the spots may affect airflow around their wings.

Monarch butterflies have distinctive orange-and-black wings with small white spots. And it's those spots that recently caught the attention of a group of scientists. As NPR's Nell Greenfieldboyce ...

Monarch butterflies with more white spots on their mostly orange-and-black wings are more successful at long-distance migration. Some scientists think the spots may affect airflow around their wings.