Whose rules?

We were back down from Ryan Mountain, sitting on one of Joshua Tree National Park's lower boulders, snacking from our picnic. One sandwich satisfied James. He considered the other one.
'They say not to feed the animals,' he remembered. 'I suppose that counts for ravens.'
'CAAAAW!'
We hadn't seen the raven, but laughed at the joke and followed the cry. It was sitting near the spikes of a Joshua Tree. James walked across the desert to face it from a distance, owed, and left his sandwich on the ground.
The bird was circumspect. It took its time, then swooped to a lower, closer branch to have a look. When it dropped to the sandwich we said goodbye. We'd broken enough rules for the day, and ravens don't like you to watch them eating.