“Because it preys principally on ants. I have said there are insect ant-eaters. This is one of them.”
“But how can such a slow creature as that get hold of them? Why, the ants could crawl out of its way in a moment!”
“That is true. Nevertheless it manages to capture as many as it requires. Remember 'the race is not always to the swift.' It is by stratagem it succeeds in taking its prey—a very singular stratagem too. If you will sit back and not frighten it, I have no doubt it will soon give you an opportunity of seeing how it manages the matter.”
Leona took a seat by the side of her mother. They were both at just such a distance from the ant-lion that they could observe every movement it made; but for a considerable time it remained quiet; no doubt, because they had alarmed it. In the interval Doña Isidora imparted to her daughter some further information about its natural history.
“The ant-lion,” said she, “is not an insect in its perfect state, but only the larva of one. The perfect insect is a very different creature, having wings and longer legs. It is one of the neuropterous tribe, or those with nerved wings. The wings of this species rest against each other, forming a covering over its body, like the roof upon a house. They are most beautifully reticulated like the finest lace-work, and variegated with dark spots, that give the insect a very elegant appearance. Its habits are quite different to those which it follows when a larva, or in that state when it is the ant-lion. It flies but little during the day, and is usually found quietly sitting amongst the leaves of plants, and seems to be one of the most pacific and harmless of insects. How very different with the larva—the very reverse—See!”
Doña Isidora pointed to the ant-lion that was just then beginning to bestir itself, and both sat silent regarding it attentively.
First, then, the little creature going backwards, and working with its callipers, traced a circle on the surface of the sand. This circle was between two and three inches in diameter. Having completed it, it now commenced to clear out all the sand within the circle. To accomplish this, it was seen to scrape up the sand with one of its fore-feet, and shovel a quantity of it upon its flat head; then, giving a sudden jerk of the neck, it pitched the sand several inches outside the traced circumference.
This operation it repeated so often, and so adroitly, that in a very short time a round pit began to show itself in the surface of the ground. Whenever it encountered a stone, this was raised between its callipers and pitched out beyond the ring. Sometimes stones occurred that were too large to be thrown out in this way. These it managed to get upon its back, and, then crawling cautiously up the sides of the pit, it tumbled them upon the edge and rolled them away. Had it met with a stone so large as to render this impossible, it would have left the place, and chosen another spot of ground. Fortunately this was not the case, and they had an opportunity of watching the labour to its conclusion.
For nearly an hour they sat watching it—of course not neglecting their other affairs—and, at the end of that time, the ant-lion had jerked out so much sand, that a little funnel-shaped pit was formed nearly as deep as it was wide. This was its trap, and it was now finished and ready for action.
Having made all its arrangements, it had nothing more to do than remain at the bottom of the pit, and wait patiently until some unfortunate ant should chance to come that way and fall in; and where these insects were constantly wandering over the ground, such an accident would, sooner or later, be certain to take place.