The first pic is of a juvenile. The next have some adults, which are distinguished by their more pink legs, beak and feathers. They get pink by ingesting Artemia salina, a small crustacean that is present in the saline waters.
It is found in parts of Africa, southern Asia (coastal regions of Pakistan and India), and southern Europe, in mudflats and shallow coastal lagoons with salt water.
Parque Natural de Las Salinas de Santa Pola.