Scattered round the main colony were many single nests, rising out of the water and evidently built up from the bottom. Here and there two or three of these were joined together--"semi-detached," so to speak. These isolated nests stood some eight inches above water-level, and as the depth exceeded a foot, their total height would be two feet or thereabouts, and their width across the hollowed top, some fifteen inches. None of the nests as yet contained eggs, and though we returned to the _pajeréra_ on the latest day we were in its neighbourhood (May 11), they still remained empty. On both occasions many hundreds of flamingoes were sitting on the nests, and on the 11th we enjoyed excellent views at close quarters. Linked arm-in-arm with Felipe, and crouching low on the water to look as little human as possible, we had approached within seventy yards before the sentries first showed signs of alarm; and at that distance, with binoculars, observed the sitting flamingoes as distinctly as one need wish. The long red legs doubled under their bodies, the knees projecting slightly beyond the tail, and the graceful necks neatly curled away among their back feathers like a sitting swan, some heads resting on the breasts--all these points were unmistakable. Indeed, as regards the disposition of the legs in an incubating flamingo, no other attitude was possible since, in the great majority of cases, the nests were barely raised above the level of the mud-plateau. To sit _astride_ on a _flat_ surface is out of the question.
Inexplicable it seems that the flamingo, a bird that spends its life half knee-deep in water, should so long delay the period of incubation. For long ere eggs could be hatched, and young reared, the full summer heats of June and July would already have set in, water would have utterly disappeared, and the flamingoes be left stranded in a scorching desert of sun-baked mud.
Being unable ourselves to return to the marisma, we sent Felipe back on May 26, when he obtained eggs--long, white, and chalky, some specimens extremely rugged. Two is the number laid in each nest. In 1872 we had obtained six eggs taken on May 24, which may therefore, probably, be taken as the average date of laying. There remains, nevertheless, the bare possibility that eggs had been laid before our visit on May 9, but swept up meanwhile by egg-raiders.