Close to the very entrance of the Convict Trail behind Kalacoon stood four sentinel trees. Every day we passed and repassed them on the way to and from the jungle. For many days we paid very little attention to them, except to be grateful for the shade cast by their dense foliage of glossy leaves. Their trunks were their most striking feature, the bark almost concealed by a maze of beautifully colored lichens, different forms overlapping one another in many places, forming a palimpsest of gray, white, pink, mauve and lilac. One day a streaked flycatcher chose the top of a branch for her nest, and this we watched and photographed and robbed for science' sake, and again we thought no more of the four trees.
Late in April, however, a change came over the trees. The leaves had been shed some time in January and the fallen foliage formed a dry mass on the ground which crackled under foot. Now each branch and twig began to send out clusters of small buds, and one day,—a week after Easter,—these burst into indescribable glory. Every lichened bough and branch and twig was lined with a soft mass of bloom, clear, bright cerise, which reflected its brilliance on the foliage itself. After two days a rain of stamens began and soon the ground beneath the trees was solid cerise, a carpet of tens of thousands of fallen stamens, and within the length of a foot on one small branch were often a score of blooms. This feast of color was wonderful enough, and it made us want to know more of these trees. But all the information we could glean was that they were called French cashew. Yet they had not nearly finished with the surprises they had in store. A hummingbird or two was not an uncommon sight along the trail at any time, but now we began to notice an increase in numbers. Then it was observed that the tiny birds seemed to focus their flight upon one part of the clearing, and this proved to be the four cashew trees.
The next few days made the trees ever memorable: they were the Mecca of all the hummingbirds in the jungle. In early morning the air for many yards resounded with a dull droning, as of a swarming of giant bees. Standing or sitting under the tree we could detect the units of this host and then the individuals forced themselves on our notice. Back and forth the hummers swooped and swung, now poising in front of a mass of blossom and probing deeply among the stamens, now dashing off at a tangent, squeaking or chattering their loudest. The magnitude of the total sound made by these feathered atoms was astounding; piercing squeaks, shrill insect-like tones, and now and then a real song, diminutive trills and warbles as if from a flock of song birds a long distance away. Combats and encounters were frequent, some mere sparring bouts, while, when two would go at it in earnest, their humming and squeaks and throb of wings were audible above the general noise.
This being an effect, I looked for the cause. The massed cerise bloom gave forth comparatively little perfume, but at the base of each flower, hidden and protected by the twenty score densely ranked stamens, was a cup of honey; not a nectary with one or two delicately distilled drops, but a good thimbleful, a veritable stein of liquor. No creature without a long proboscis or bill could penetrate the chevaux-de-frise of stamens, and to reach the honey the hummingbirds had to probe to their eyes. They came out with forehead well dusted with pollen and carried it to the next blossom. The destiny of the flower was now fulfilled, the pot of honey might dry up, the stamens rain to the earth and the glory of Tyrian rose pass into the dull hues of decay.
Day after day as we watched this kaleidoscope of vegetable and avian hues, we came to know more intimately the units which formed the mass. There were at least fifteen species and all had peculiarities of flight and plumage so marked that they soon became recognizable at sight.
After our eyes had become accustomed to specific differences in these atoms of birds we began to notice the eccentricities of individuals. This was made easy by the persistence with which certain birds usurped and clung to favorite perches. One glowing hermit clad in resplendent emerald armor selected a bare twig on a nearby shrub and from there challenged every hummer that came in sight; whether larger, smaller or of his own kind made no difference. He considered the cashew trees as his own special property and as far as his side of them went he made good his claim. I have never seen such a concentration of virile combative force in so condensed a form.
In some such way as vultures concentrate upon carrion, so news of the cashew sweets had passed through the jungle. Not by any altruistic agency we may be certain, as we watch the selfish, irritable little beings, but by subtile scent, or as with the vultures, by the jealous watching of each other's actions. I observed closely for one hour and counted one hundred and forty-six hummingbirds coming to the tree. During the day at least one thousand must visit it.
They did not have a monopoly of the cashew manna, for now and then a honey-creeper or flower-pecker flew into the tree and took toll of the sweets. But they were scarcely noticeable. We had almost a pure culture of hummingbirds to watch and vainly to attempt to study, for more elusive creatures do not exist. Convict Trail revealed no more beautiful a sight than this concentration of the smallest, most active and the most gorgeous birds in the world.
Such treats—floral and avian—were all that might be expected of any tree, but the cashews had still more treasures in store. The weeks passed and we had almost forgotten the flowers and hummingbirds, when a new odor greeted us, the sweet, intense smell of overripe fruit. We noticed a scattering of soft yellow cashews fallen here and there, and simultaneously there arrived the hosts of fruit-eating birds. From the most delicate turquoise honey-creepers to great red and black grosbeaks, they thronged the trees. All day a perfect stream of tanagers—green, azure and wine-colored—flew in and about the manna, callistes and silver-beaks, dacnis and palm tanagers. And for a whole week we gloried in this new feast of color, before the last riddled cashew dropped, to be henceforth the prize of great wasps and gauze-winged flies, who guzzled its fermented juice and helped in the general redistribution of its flesh—back to the elements of the tropic mold, to await the swarms of fingering rootlets, a renewed synthesis—to rise again for a time high in air, again to become part of blossom and bird and insect.
It was along this Convict Trail that I sank the series of pits which trapped unwary walkers of the night, and halfway out at pit number five, the army ants waged their wonderful warfare.