Wattled Crane
Wattled cranes breed only in wetlands. Breeding pairs maintain a territory, so that nests are always at least 500m apart. One or two eggs are laid, but only one ever hatches, the other being abandoned. This seems wasteful, but if wattled crane chicks are put together they fight to the death. Laying the second egg is probably insurance against the first failing to hatch.
Uploaded on November 11, 2015