American flamingo, phoenicopterus ruber standing with one foot in the shallow water environment, resting and sleeping with its bill tucks under the plumage, close up shot

american flamingo phoenicopterus ruber neck tuck plumage head bill beak animal bird species behaviour stand rest sleep feather conserve heat energy coastal wetland tropical environment wild wildlife flock group nature habitat natural ecosystem singapore zoo park mandai reserve conservation long foot wading shallow water paradise south america caribbean exotic pink