A large brownish moth that is often active during the day. The caterpillars typically bear irritant hairs and make an egg-shaped cocoon.
- ‘Adult oak eggars are also preyed upon by several birds, particularly black-headed gulls.’
- ‘I'm fairly sure this is the caterpillar of an oak eggar moth, but I would welcome being corrected.’
- ‘The Small Eggar moth is another rarity found only in this part of Shropshire.’
Early 18th century: probably from egg + -er.