Usually flamingos lay one large egg at a time (the eggs weigh to 115 to 140 grams). However, it can lay two eggs at a time but its uncommon that both eggs will hatch. Eggs hatch after 30 days. Milk that comes from the flamingos throat can be produced by both parents to feed their young until two months of age. It's called crop milk. It is red color. And it's similar to mammal milk.

 The Andean flamingo is the only species with yellow legs.

 A group of flamingos is called a flock ( can be up to 200 birds).

 There are 19 bones in a flamingos neck.

 The bend halfway down the flamingos leg is actually its ankle, not its knee.
Flamingo legs can be longer than their entire body.
 Flamingo can stand on one leg without any muscle activity at all. 

 1 out of 300 people has an irrational phobia  of flamingos.

 There are more plastic flamingos in the USA then real ones.

 Flamingos feel most secure when they are crowded together.

 Some flamingos tolerate water temperatures more than 150*F (66*C) and night temperatures of –22*F (-30*C).
The flamingo is the national bird of the Bahamas.

Some think that flamingos stand on one leg to dry it off from time to time, since they spend so much time in the water. Others think they stand on one leg because they only turn off one side of their brains when they sleep.
Another popular theory holds that standing on one leg could be a form of camouflage. Fish can probably think that it's not a flamingo but a reed or small tree.