Mazothairos was a large insect that lived in North America and looked similar to an owlet moth.
The Mazothairos genus belonged to a group of insects that fed mainly on sap, which it sucked from the trees in the swamp forest, and their mouth parts were adapted for this purpose. Many of these insects had coloured wing patterns that can still be seen on the fossils.
They may have been the ancestors of many present-day insects.