Then I found this.
I was leisurely travelling along, attentively examining some peculiar plants which I had collected, when all at once I felt the air strongly agitated, though the day was perfectly calm and sultry. I immediately cast my eyes toward the cleared ground, from which I was but at a small distance, in order to see whether it was not occasioned by a sudden shower; when at that instant a sound resembling a deep rough voice, uttered, as I thought, a few inarticulate monosyllables. Alarmed and surprised, I precipitately looked all round, when I perceived at about six rods distance something resembling a cage, suspended to the limbs of a tree; all the branches of which appeared covered with large birds of prey, fluttering about, and anxiously endeavouring to perch on the cage. Actuated by an involuntary motion of my hands, more than by any design of my mind, I fired at them; they all flew to a short distance, with a most hideous noise: when, horrid to think and painful to repeat, I perceived a negro, suspended in the cage, and left there to expire! I shudder when I recollect that the birds had already picked out his eyes, his cheek bones were bare; his arms had been attacked in several places, and his body seemed covered with a multitude of wounds. From the edges of the hollow sockets and from the lacerations with which he was disfigured, the blood slowly dropped, and tinged the ground beneath. No sooner were the birds flown, than swarms of insects covered the whole body of this unfortunate wretch, eager to feed on his mangled flesh and to drink his blood. I found myself suddenly arrested by the power of affright and terror; my nerves were convoked; I trembled, I stood motionless, involuntarily contemplating the fate of this negro, in all its dismal latitude. The living spectre, though deprived of his eyes, could still distinctly hear, and in his uncouth dialect begged me to give him some water to allay his thirst. Humanity herself would have recoiled back with horror; she would have balanced whether to lessen such reliefless distress, or mercifully with one blow to end this dreadful scene of agonising torture! Had I had a ball in my gun, I certainly should have despatched him; but finding myself unable to perform so kind an office, I sought, though trembling, to relieve him as well as I could. A shell ready fixed to a pole, which had been used by some negroes, presented itself to me; filled it with water, and with trembling hands I guided it to the quivering lips of the wretched sufferer. Urged by the irresistible power of thirst, he endeavoured to meet it, as he instinctively guessed its approach by the noise it made in passing through the bars of the cage. "Tanke, you white man, tanke you, pute some poison and give me."