There is absolutely no other bird song with which to compare it. The timbre, when heard at a distance, is that of the Wood Thrush quality—sweet, liquid and altogether ethereal. But the distinctness of the notes and their remarkably intricate trios and gradations are wholly unique. Three or four large species of Antbirds ran rapidly here and there, holding their short tails erect and jerking them frequently, thus presenting a decidedly ralline appearance. We saw several Little Tinamous[3] in the course of the day, one of which I shot. When the cook cleaned it in the evening, he found an egg about to be laid. Several days later a short distance from the clearing, a bird of this species was flushed from a slight hollow between the buttresses of a mora. The following day when the bird flew from the same spot it was found that an egg had been deposited. It was of a burnished purple color and was 35 × 45 mm. in size. Although we knew that the egg had been laid less than twenty-four hours before, yet it contained an embryo corresponding to a four day chick. This fact, in the case of these generalized birds, may have some significance when we remember the advanced state of embryonic development characterizing the newly laid eggs of many reptiles. After an hour or more of the most careful stalking in a low swampy valley, we heard the unmistakable thunderings of Trumpeters[25] or Warracabras, and my blood leaped in response. Long before I could hear them, Francis had distinguished the low booming note amid all the other jungle sounds. I had studied specimens for months in the north and had searched in vain for any definite account of their habits. And now, although the briefness of my stay would permit of almost no chance for real investigation, yet here at any rate were the birds themselves in their native haunts. At last we flushed two which flew down from their perch with a sudden whirr of wings and ran swiftly out of sight. As they flew they uttered the familiar _Chack! chack!_