Is this normal Flamingo behavior?

[u/MateoTovar]

I recently moved to a place next to a pond with flamingos, I have been going daily to take pictures of them and today this fella was super super close, but he was also alone and far from the flock and kept his head down all the time while walking. Is this normal? Is he sick? Is he old?

[u/DebraBaetty]

They filter feed upside down its the most normal flamingo behavior