Tau emperor

Aglia tau
Saturniids (Saturniidae)

Black band and markings.
Tau emperoron RikenMon's Nature.Guide

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A large butterfly with ochre to brown wings. On all 4 wings, there is a blue-black marking enclosing a white T shape with a dark stripe which is wider at the rear.  The under surface is brown marked with a white band, the front wings have a black outline to the white T shape, the rear wings do not. The antennae of the ♂ are clearly feather-shaped, the ♀ are thread-like.  The sturdy body is hairy.

Mostly sitting flat, however, it is able to close its wings to reveal its under surface. The ♀ is considerably larger than the ♂ and a little lighter in colour. Prefers birch wood. The caterpillar changes a lot during its stages, starting with long red white thorns which disappear in the final stage. 

⇔ wsp. 55-85 mm

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