Flamingos get their pink from a group of natural pigments called carotenoids. These are the same compounds responsible for the orange of a carrot, the red of a tomato, and the yellow of a sunflower. Carotenoids are produced by plants, algae, and certain bacteria. Animals cannot make them from scratch. They have to eat them.

For flamingos, the primary source is the blue-green algae and brine shrimp that thrive in the shallow, highly alkaline or saline lakes where flamingos feed. These organisms are packed with carotenoids, particularly one called canthaxanthin. When a flamingo consumes them, the carotenoids are absorbed through the digestive system, broken down by liver enzymes, and deposited into the feathers, skin, and beak.

The more carotenoid-rich the diet, the deeper and more saturated the pink. A flamingo feeding in a lake abundant with algae will develop a vivid, almost coral red. A flamingo in a less productive environment will be a pale, washed-out blush. The colour is a direct readout of nutritional history.

This makes flamingos living colour charts. You can read something true about their environment and their diet just by looking at them.

Why the lakes matter

It is worth pausing to appreciate just how specialised flamingo feeding habitats are. The lakes and lagoons where flamingos gather are not pleasant environments by most standards. They are extremely salty or alkaline, often too caustic for most other animals to survive in. Water temperatures can reach extremes. The conditions that make these lakes hostile to others are exactly what allow the algae and brine shrimp to thrive without competition.

Flamingos have evolved a remarkable filtering system to feed in these environments. Their beaks are held upside down in the water, and a specialised structure inside works like a sieve, pumping water through and trapping the tiny organisms they feed on. They can consume enormous quantities of algae and shrimp in a single day, which is precisely what allows carotenoids to accumulate in their tissue at the concentrations needed to produce that intensity of colour.

When flamingo habitats are disrupted by drought, pollution, or habitat loss, the feeding grounds become less productive. The algae thin out. The shrimp populations drop. And within months, the colour of an entire flock begins to tell the story. A paler population is often an early sign that something in the ecosystem is changing.

The flamingo's colour is, in this sense, an environmental indicator. A biological warning system. A readout of the health of a whole lake written in pink.

There is another layer to this worth knowing. Among flamingos, colour is not just aesthetic. It is social.

Brighter, more deeply coloured individuals tend to be healthier, better nourished, and more successful breeders. Studies have shown that flamingos with more intense colouration are more attractive to potential mates and tend to occupy more dominant social positions within the flock.

Flamingos actually enhance their colour during breeding season. They spread a reddish oil secreted from a gland near their tail across their feathers using their beak, intensifying the colour at exactly the moment it matters most for attracting a partner. After breeding season, this behaviour drops off and the colour fades slightly.

The pink is not decoration. It is information. A signal broadcast to every other flamingo in the flock about health, nutrition, and reproductive fitness.

Carotenoid colouration is not unique to flamingos. Salmon get their pink flesh from the crustaceans they eat. Goldfish kept without carotenoid-rich food will fade toward white. Canaries fed on certain plant-based diets can shift from yellow toward orange. Even the yolk of a free-range egg is deeper yellow than a factory-farmed one because the hens have access to more varied, carotenoid-rich food.

Colour in the natural world is rarely passive. It is metabolic. It is relational. It reflects what an organism has consumed, where it has lived, and what resources it has had access to.

Which is another way of saying: colour carries information far beyond what it appears to be on the surface.

That is something we think about a lot at CMY Cubes. The colours you see shifting through our resin, the way cyan bleeds into magenta or yellow catches the light at a new angle, those are not arbitrary. They are the physics of light itself made visible. Colour, in every context, is a story. You just have to know how to read it.