From A Wiki of Ice and Fire
Bloodflies are bloodsucking glistening purple insects found in Essos. They can grow as large as bees, live in marshes and stagnant pools and lay their eggs in the dead and dying.
Wine of Courage is made of bloodfly larva.
- ↑ A Game of Thrones, Chapter 64, Daenerys VIII.
- ↑ A Storm of Swords, Chapter 23, Daenerys II.