"Help me," Fox called, maw twisting to look at the bird that had perched itself on a rock not far from it's trapped form.
"I have heard of how you dealt with others whom helped you." Crow said as it hopped further away from the trapped mammal.
"If you don't then I will surely die!" the animal cried.
The bird's beak clicked, "Yes," it agreed, "You surely will."
"I'll capture you a hare that will keep you fed for days!" Fox bargained.
Crow tilted its head, "But you, my dear Fox, shall keep me fed even longer when you die."
Fox struggled uselessly, "You can't do that!"
"Oh, but I can," Crow told the mammal, "After all, the only thing I must do is wait for you to die."
And thus Crow waited, watching Fox wriggle and writhe in an attempt to get free only to injure itself even more until eventually those attempts died to stillness. Crow did not stay the entire time by Fox's side, no Crow took wing various times to quench it's thirst- occasionally, it would find a thick enough leaf or thin enough piece of rock that was curved well enough to hold water and it would carry water back to Fox's side and drink at it's leisure there. Only when Crow was certain that Fox had died did it approach the body and finally feasted at it's leisure; it was the easiest meal Crow ever had, it was merely a test of patience.
All things die after all, and all the quicker when none wished to help them when they need it.