• The ‘squabble’ evidently is about either feeding or mating dominance.
• Couldn’t find the photog; sorry.
• Their pale orangey-pink coloration is typical for the species, in contrast to the more vivid coloration of some other flamingos, but that’s also strongly linked to diet.
• Speaking of diet, it’s mainly algae, plankton, crustaceans, insects, mollusks and other invertebrates—from the water of the coastal mudflats, estuaries, lagoons, and salt lakes where it lives. (thanks, WP)

Another factor in their color is simply age. For example, here’s a young juvenile below:

(right-click as needed)

And an older juvenile:

Thanks again to WP:
https://en.wikipedia.org/wiki/Chilean_flamingo