In the Air: Butterflies

Saba’s Butterflies

Heliconius, Phoebis, Dione

Kai Wulf

About

Many species of butterflies flit between Saba’s beautiful flowering plants, in colors and patterns just as vibrant. All of the island’s butterflies (and all butterflies in general, really) eat nutritious nectar and other liquids that they slurp up through their long, straw-like proboscis. The species featured here are three of the most commonly seen among the roughly 30 species of butterflies and moths found on Saba. 

Zebra longwings stand out during the day with their bold, black-and-white stripes. At night, you may also see these butterflies gathered in large groups of up to 60 individuals to rest — a safety-in-numbers behavior that helps to protect them from predators. As caterpillars they’re also black-and-white, but opt for polka-dots instead of stripes. These colors are defensive, letting predators know to stay away or get a mouthful of poison, which this species produces by eating nectar that they then metabolize into toxins. 

Gulf fritillaries are large, orange butterflies that range throughout the Caribbean and Central America. Although the topsides of their wings are vividly colored, the undersides are a dull brown, which makes for effective camouflage when they sit still and fold them closed. They’ve been known to have a bit of a rivalry with zebra longwings, and often fight over territory when they lay their eggs.

The cloudless sulphur — named for their large, yellow, sulfur-colored wings — is yellow throughout most of its life. Their eggs are shaped like tiny vases, and can range from white to pale yellow. Caterpillars are yellow or greenish in color, with horizontal brown stripes, and even their chrysalis, with its angular, flower-like shape, is yellow with pink-and-green undertones.

Header image by Kai Wulf.

These species are:
Native

Why that matters:
Native species are those that evolved in the region naturally, without human influence. That means they’re specifically adapted to Saba’s habitat, and play a key role in island biodiversity. When we lose native species, gaps appear in the ecosystem. That leads to cascades of additional extinctions, and to the loss of the ecosystem services (food, clean air and water, flood and coastal protections, and more) that we humans rely on.

A cloudless sulphur on Saba. Credit: Kai Wulf | reefguard.net

iNaturalist Observations

Where locals, researchers, and visitors have seen this species.

Saba Island Map and Pins: iNat Taxonomy ID 47224

Google / Imagery © 2023 CNES / Airbus, Landsat / Copernicus, Maxar Technologies, U.S. Geological Survey, iNaturalist Map data @2023

This map shows geotagged observations of this species made on iNaturalist, the world’s largest community-science platform.

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  • Observations of land species in water:
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Ask a Scientist

Question: What is it so important to protect Saba’s biodiversity?

Answer: Because islands have the highest concentration of biodiversity on Earth, and yet 75% of all recent bird, reptile, amphibian, and mammal extinctions that occurred on our planet have happened on islands. With 85% of most remaining species highly threatened (including half of all birds), islands must be a priority.

Dr. Rayna Bell
Curator of Herpetology and Islands 2030 Co-Director, California Academy of Sciences

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