Close up shot of a flock of American flamingo, phoenicopterus ruber standing with one foot, preening and grooming its vibrant plumage, an exotic bird species

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 singapore zoo park mandai reserve conservation long foot wading paradise south america caribbean exotic pink preen groom clean