This thing all things devours:
Birds, beasts, trees, flowers;
Molds iron, bites steel;
Grinds hard stones to meal;
Slays king, ruins town,
And beats the highest mountain down.
- Tolkien, The Hobbit
This was partly inspired by the riddle from The Hobbit, and by a dream I had about an abnormally huge crow ripping apart and eating small birds... Disturbing stuff, but very inspirational! And somehow, in my sleep-deprived mind, the two things fit together - and this was the outcome.
It took many, many hours (more like weeks) and was done in pencil on A3.