Phoebis sennae

In autumn, particularly along North Carolina's coast, people see impressive numbers of butter-yellow butterflies flying about. Mark their course and you'll notice that they're heading north. These are cloudless sulphurs, a tropical species whose populations build until there are massive emigrations. Cold weather ultimately dooms their progression and we don't see them again until next year.

Cool Links:

Cloudless Sulphur - on-line field guide page with photos. From the San Diego Natural History Museum.

Cloudless Sulphur - photos of adult and pupa and several links.

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