Tau Emperor Moth | Aglia tau EGGS

Aglaia tau, commonly known as the Tau Emperor, is a charismatic moth in the Saturniidae family. Native to Europe and parts of western Asia, this moth is named after the distinctive tau-shaped (Τ) markings on its wings. Its size and elegant patterns make it a notable species in its range.

The Tau Emperor has a wingspan of 6–8.5 cm, making it a mid-sized moth, with males being slightly smaller than females. The forewings are a soft, tawny brown with subtle patterns and small eyespots, while the hindwings are lighter and feature prominent eyespots. The tau-shaped marking on the forewings, from which the species gets its name, is surrounded by darker shading, creating a striking contrast. The moth's body is robust and covered in fine hairs, giving it a velvety appearance.

This species is found across central and southern Europe, extending into parts of Asia Minor and western Asia. Its preferred habitats include deciduous and mixed forests, as well as wooded areas and gardens. It is particularly associated with regions that have an abundance of its host plants.

The Tau Emperor is primarily diurnal, flying and breeding during daytime, and is active from March to June, depending on the local climate. Adults do not feed and live only to reproduce. Males are strong fliers and actively search for females by following pheromones, often traveling significant distances, particularly enjoying sunny weather.

The larvae feed on a variety of deciduous trees, including oak (Quercus), beech (Fagus), birch (Betula), and willow (Salix). The caterpillars are bright green with yellow lateral stripes and spiny tubercles, providing camouflage among foliage. As they mature, the larvae develop a more robust appearance and lose their spines. They pupate underground, where they overwinter before emerging as adults in the spring.

Aglaia tau is not considered endangered, and its populations are stable across much of its range. However, habitat loss and changes in forest management practices can impact local populations. Conservation efforts that preserve mixed and deciduous forests help ensure the continued presence of this species.

Host plants: Hornbeam, Lime, Oak, Beech, Birch, Willow

Difficulty: Easy (2/10)

Temperature: Room temperature or can be reared outdoors (securely)

Lifecycle: Day-flying moths emerge in early spring; caterpillars pupate underground and emerge the following spring!