It was during the summer of 1821 that the famous cave at Kirkdale was discovered, and the bones of twenty-two different species of animals were brought to light. Careful examination showed that the cave had for a long time been the haunt of hyænas of the Pleistocene Period, a geological division of time, which embraces in its latter part the age of Palæolithic man. The spotted hyæna that is now to be found only in Africa, south of the Sahara,[1] was then inhabiting the forests of Yorkshire and preying on animals now either extinct or only living in tropical climates. The waters of Lake Pickering seem to have risen to a sufficiently high level at one period to drive out the occupants of the cave and to have remained static for long enough to allow the accumulation of about a foot of alluvium above the bones that littered the floor. By this means it appears that the large quantity of broken fragments of bones that were recent at the time of the inundation were preserved to our own times without any perceptible signs of decomposition. Quarrying operations had been in progress at Kirkdale for some time when the mouth of the cave was suddenly laid bare by pure accident. The opening was quite small, being less than 5 feet square, and as it penetrated the limestone hill it varied from 2 to 7 feet in breadth and height; the quarrying had also left the opening at a considerable height up the perpendicular wall of stone. At the present time it is almost inaccessible, and except for the interest of seeing the actual site of the discoveries and the picturesqueness of the spot the cave has no great attractions.
[1] Dawkins, W. Boyd. "Early man in Britain," p. 103.
Not long after it was stumbled upon by the quarrymen Dr William Buckland went down to Kirkdale, and although some careless digging had taken place in the outer part of the cave before his arrival, he was able to make a most careful and exhaustive examination of the undisturbed portions, giving the results of his work in a paper read before the Royal Society in 1822.[1] Besides the remains of many hyænas there were teeth or bones of such large animals as the elephant, rhinoceros, hippopotamus, horse, tiger, bear, urus (Bos primi-genius) an unknown animal of the size of a wolf, and three species of deer. The smaller animals included the rabbit, water-rat, mouse, raven, pigeon, lark and a small type of duck. Everything was broken into small pieces so that no single skull was found entire and it was, of course, impossible to obtain anything like a complete skeleton. From the fact that the bones of the hyænas themselves had suffered the same treatment as the rest we may infer that these ferocious lovers of putrid flesh were in the habit of devouring those of their own species that died a natural death, or that possibly under pressure of hunger were inclined to kill and eat the weak or diseased members of the pack. From other evidences in the cave it is plain that its occupants were extremely fond of bones after the fashion of the South African hyæna.
[1] Buckland, The Rev. Wm. "Account of an assemblage of fossil teeth and bones ... at Kirkdale."
Although the existing species have jaws of huge strength and these prehistoric hyænas were probably stronger still, it is quite improbable that they ever attacked such large animals as elephants; and the fact that the teeth found in the cave were of very young specimens seems to suggest that the hyænas now and then found the carcase of a young elephant that had died, and dragged it piecemeal to their cave. The same would possibly apply to some of the other large animals, for hyænas, unless in great extremes of hunger never attack a living animal. They have a loud and mournful howl, beginning low and ending high, and also a maniacal laugh when excited.
It might be suggested that the bones had accumulated in the den through dead bodies of animals being floated in during the inundation by the waters of the lake, but in that case the remains, owing to the narrowness of the mouth of the cave, could only have belonged to small animals, and the skeletons would have been more or less complete, and there are also evidences on many of the bones of their having been broken by teeth precisely similar to those of the hyæna.