I observed ravens think! I saw a raven rest on a telephone wire with what looked like a biscuit in its mouth. It looked around, then flew down to a puddle of water and dropped the biscuit in the water. This turned out to be a piece of bread roll, that I assume was hardened, and the raven dropped it into the water to soften it. Both male and female then came to eat the bread, before taking some up to a nearby branch to feed their young. Amazing!