Mary, then, saw first. What she saw were two very small shining, brown, gently curved, sharp-pointed, sickle-like jaws sticking up out of the loose sand in the very bottom of one of the pits. They moved once, these curved and pointed jaws, and that movement caught Mary's eye.
"It's the dragon of the pit," I cried. "Dig him out!"
So Mary dug him out. He was very spry and had a strong tendency to shuffle backwards down into the hiding sand. But it takes a keen dragon to get away from Mary, and this one wasn't and didn't.
He was an ugly little brute, squat and hump-backed, with sand sticking to his thinly haired body. But he was fierce-looking for all his diminutiveness. Remember again that whether a thing is big or little to you depends on whether you are big or little. This dragon of the sand-pit was little to us. He is terribly big to the ants.
When Mary got him out and had put him down on the sand near the pit, he trotted about very actively but always backwards. He seems to have got so used to pulling backwards against the frantic struggles of his prey to get up and out of the pit, that he can now only move that way. After we watched him a while, we "collected" him; that is, put him into a bottle, with some sand, to take home and see if we could keep him in our room of live things. Then we turned our attention to another crater. It was about three inches across at the top and about two inches deep; a symmetrical little broad-mouthed funnel with the loose sand-slopes just as steep as they could be. The slightest disturbance, a touch with a pencil-point for example, would start little sand avalanches down the slopes anywhere. It is, of course, easy to see how this horrible pit-trap works. And, in fact, in the very next moment we saw actually how it did work.
A foraging brown ant that was running swiftly over the ground plunged squarely over the verge of the crater before she could stop. She certainly tried hard to stop when once over, but it was too late. Slipping and sliding with the rolling sand-grains, down she went right toward those waiting scimitar-like jaws.
Now, these jaws deserve a word of description. Because, horrible as they may seem to the unfortunate ants, they are so well arranged for their particular purpose that they must attract our admiration. The dragon of the pit, ant-lion he is usually called, has no open, yawning mouth behind those projecting jaws, as might be expected. Indeed there is no mouth at all, just a throat, thirsty for ant blood! The slender scimitar jaws have each a groove on the concave inner side, and down this groove runs the blood of the struggling victim, held impaled on the sharp points of the curving mandibles. The two fine grooves lead directly into the throat, and thus there is no need of open mouth with lips and tongue, such as other insects have.
"But see," cried Mary, "the ant has stopped sliding. It is going to get out!"
Ah, Mary, you are not making allowance for all the resources of this dreadful dragon of the pit. Not only is the pit a nearly perfect trap, and the eager jaws at the bottom more deadly than any array of spikes or spears at the bottom of an elephant pit, but there is another most effective thing about this fatal dragon's trap, and that is this: it is not merely a passive trap, but an active one. Already it is in action. And Mary sees now how hopeless it is with the ant. For a shower of sand is being thrown up from the bottom of the pit against the ant and it is again sliding down. The dragon has a flat, broad head and powerful neck muscles, and has wit enough to shovel up and hurl masses of dry sand-grains against the victim on the loose slopes. And this starts the avalanche again, and so down slides the frantic ant.
What follows is too painful for Mary and me to watch and certainly too cruel to describe. But one must live, and why not ant-lions as well as ants? If truth must be told, many ants have as cruel habits and as bloodthirsty tastes as the ant-dragon. Indeed, more cruel and revolting habits. For ants have a gastronomic fondness for the babies of other ants, which is a fondness quite different from that which they ought to have. It means that they like these babies—to eat. Some communities of ants, indeed, spend most of their time fighting other communities just to rob them of their babies, which they carry off to their own nests and use in horrible cannibalistic feasts.