Eterusia tricolor Hope, 1840 Day Flying Moth, Zygaenidae

Eterusia tricolor is a species of moth belong to Zygaenidae family, they are day-flying moths with very colorful wings. Members of the family have been know with hydrogen cyanide in all states of their life cycle. Color of the insects is signal of information that they are toxic insects and they use hydrogen cyanide as a defense factor to protect them from predator.

Eterusia tricolor is quite common species in high mountains of Vietnam, they are weak flying insects and usually fly over the canopy of the forests. As being damaged, they release from their body some drops (mixed with air) of hydrogen cyanide (HCN) as a defensing behavior.

A individual of Eterusia tricolor

A being touched, the insect releases a droplet of hydrogen cyanide (HCN)