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Foam

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Gustave Doré

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Carriola Tussock Moths: these moths have translucent patches (i.e. hyaline windows) on their wings, and their green-tinted veins are clearly visible within

Above: Carriola witti

Moths of the genus Carriola have a very unusual appearance, as their wings are covered in translucent patches that reveal a delicate network of greenish-yellow veins. The green coloration is caused by the haemolymph (i.e. "blood") that passes through these veins.

Above: the male form of Carriola thyridophora, with a close-up of the hyaline windows and bright green veins on its wings

The males of this genus typically have brown or beige borders around their wings, while the females have pink or white borders instead. The hyaline windows also tend to be much clearer and more extensive in the females.

Above: the female form of Carriola seminsula

This article describes the adaptive benefits of wing transparency in moths:

The coevolutionary arms race between prey and predator has generated some of the most striking adaptations in the living world, including lures, mimicry and camouflage in prey. Transparency, by definition, constitutes the perfect background matching against virtually all types of backgrounds. Transparency is common in pelagic environments where there is no place to hide.

Above: genus Carriola

Carriola tussock moths can be found in many different countries throughout Southeast Asia, including Indonesia, Singapore, Thailand, Laos, Myanmar, the Philippines and Malaysia. They also inhabit certain parts of China, India and Sri Lanka.