Claudio Contreras Koob / Nature Picture Library
As a child, photographer Claudio Contreras Koob visited the coast of the Yucatán Peninsula, Mexico, with his father every summer. He watched the flamingos in the wetlands behind their holiday home for hours -- and decades later, is sharing his obsession for Mexico's "iconic species" in his new photography book, "Flamingo." Look through the gallery to see more of his striking images.
Claudio Contreras Koob
Flamingos are social birds that gather in large groups called a flamboyance, or a colony. Koob spent 10 years gathering the 120 photos for the book, patiently gaining the trust of the birds and photographing them at two reserves in Yucatán: the Ría Celestún Biosphere Reserve, Yucatán (pictured), is one of their favorite feeding sites.
Claudio Contreras Koob / Nature Picture Library
Flamingos get their vivid pink coloring by eating algae and brine shrimp that are rich in carotenoids, a reddish-orange pigment. The intensity of a flamingo's color is an indicator of its health and a signal to potential mates, says Koob.
Claudio Contreras Koob / Nature Picture Library
Mexico has taken steps to protect the salty, brackish water and wetlands that the birds live in, and created two reserves: Ría Lagartos where the flamingos nest, and Ría Celestún, an important feeding site.
Claudio Contreras Koob / Nature Picture Library
Flamingos migrate every year, flying mostly at night and sometimes for very long distances says Koob, adding that tagging conducted by Mexico's Flamingo Conservation Program has revealed that the colonies in Yucatán travel to the Bahamas, US and Cuba.
Claudio Contreras Koob / Nature Picture Library
Flamingos build volcano-shaped nests from mud, which can hold one large egg. The birds pictured here are nesting in Ría Lagartos Biosphere Reserve in the Yucatán Peninsula, a favored breeding site. Last year, the National Commission of Natural Protected Areas (CONANP) estimated there were around 15,000 nests at Ría Lagartos.
Claudio Contreras Koob / Nature Picture Library
The eggs are incubated for a month before hatching. Parents recognize their young through the unique sound of its call, and they will not feed any other chicks.
Claudio Contreras Koob / Nature Picture Library
Chicks are keen explorers, says Koob. To keep the chick's in the nest, the adult flamingos try to hold them between their feet.
Claudio Contreras Koob / Nature Picture Library
Both male and female flamingos feed their young a substance called "crop milk" which they create in the upper digestive tract. Crop milk has a similar fat and protein content to mammal milk, and has a red hue that will help the chick grow its first pink feathers when it is older.
Claudio Contreras Koob / Nature Picture Library
At five to 12 days old, chicks leave the nest and their down feathers begin to turn grey, but they still rely on their parents for food. At around three months old, the chicks' beaks will hook so they can feed themselves, and they start to lose their grey down and grow feathers suitable for flight.
Claudio Contreras Koob / Nature Picture Library
Flamingos take two to three years to fully mature -- these juvenile flamingos at Ría Celestún Biosphere Reserve are still speckled with white feathers, even as their signature pink plumage comes through.
CNN  — 

Since he was four years old, photographer Claudio Contreras Koob has been obsessed with flamingos: their vibrant pink feathers, horn-like curved beaks, and elegant, poised necks.

Born and raised in Mexico City, Koob visited the Yucatán Peninsula every year during school holidays. His father built a house on sand dunes in the port village of Chuburná, between the sea and wetlands, and together they watched flamingo colonies gather in the lagoons and muddy swamps that stretched for miles behind the house.

“It was a very beautiful sight when we were able to spot a pink-orange mass of birds in the distance,” says Koob. “That stayed in my memory.”

The Caribbean flamingo is “emblematic” of the Yucatán Peninsula, where his father is from, says Koob, appearing on beach towels, pool inflatables, garden furniture, and even on packaging for pink salt. But despite its popularity, in Yucatán and beyond, little is known about its movements and biology, he says.

Claudio Contreras Koob / Nature Picture Library
The Caribbean flamingo lives in salty wetland and coastal waters around Mexico, the US and the Caribbean.

Now, decades after his first sightings of this “iconic bird,” Koob is sharing his passion in a new photography book, “Flamingo,” published last month.

Koob hopes his intimate portraits of the bird will help others to “fall in love with flamingos” and inspire them to care about the wetlands where they live.

From lab to lens

Koob’s childhood fascination with nature led him to study wildlife biology at the National Autonomous University of Mexico, where he took a course in microphotography and discovered “what the language of photography could do,” he says.

Combining his passions, Koob focused on conservation photography when he left university. He joined the International League of Conservation Photographers which in 2009, asked him to capture the tagging of flamingo chicks in Yucatán.

With the support of Mexico’s Flamingo Conservation Program, run by Fundación Pedro y Elena Hernández since 2015, Koob spent several years collecting the images that make up his book. He says the biggest challenge was getting close to breeding birds.

“If you disturb one, they start screaming and flying away, and you can cause a panic. They could leave all the eggs, and abandon the colony,” says Koob.

Claudio Contreras Koob / Nature Picture Library
Koob spent years gaining the trust of the flamingos so that he could photograph their nesting colonies and young chicks.

Koob says his “slow approach” to photography enabled him to gather intimate images of the flamingos. He often wore camouflage, army crawling across muddy ground to get close to the birds without scaring them.

On some occasions, he took a boat into the lagoons before dawn so the birds would be accustomed to his presence by sunrise, and stayed until after nightfall. “That is tough, with the sun and 40 degrees (heat),” says Koob. “It’s very consuming for the body.”

Pretty in pink

Unlike humans, flamingos are well adapted for their extreme environment.

Gathering in groups known as a flamboyance, flamingos typically live in brackish water, but some inhabit alkaline “soda lakes” filled with water so high in sodium carbonate it would irritate or burn the skin of most animals.

Claudio Contreras Koob / Nature Picture Library
Flamingos use their hooked beaks to feed on shrimp, mollusks and algae that are rich in carotenoids, the pigment that gives them their pink coloring.

Here, the flamingos encounter few predators or other birds that would compete for food. Flamingos need to consume 10% of their bodyweight daily, says Koob – so having long, undisturbed feeding times is important.

Their diet comprises algae, shrimps and mollusks containing large amounts of carotenoids – the same pigments that give fruits and vegetables like carrots, pumpkins, and tomatoes their coloring – and which are responsible for the flamingo’s signature hot-pink appearance, says Koob.

Wetlands under threat

Flamingo conservation has been a high priority for Mexico since the 1970s and ’80s, when it established two federal wetland reserves on the Yucatán peninsula, later designated as UNESCO Biosphere Reserves.

Ría Lagartos to the east is where the flamingos nest and breed, while on Yucatán’s western border, Ría Celestún is an important feeding site. Additional reserves established by the local Yucatán government mean that almost all the peninsula’s wetlands are protected, says Koob.

Flamingo numbers have been increasing since the establishment of the parks, say Koob. Based on the number of nests at the breeding colony in Ría Lagartos, the National Commission of Natural Protected Areas (CONANP) estimates there were around 30,000 adult birds in 2021.

But these reserves don’t offer complete protection, he says. Agrochemicals used in highland regions flow through underwater river systems and pollute the wetlands, and while the reserves are supposed to be protected from urban development, Koob says there are still instances of illegal building and trash disposal.

Claudio Contreras Koob / Nature Picture Library
Up to 50,000 tourists come to see the flamingos every year at Ría Celestún (pictured) -- although Koob warns that this could disrupt their eating habits.

Climate change and rising sea levels threaten flamingo habitat, and tourism also has an impact. While the nesting colony is closed to tourists, up to 50,000 visitors come to see the flamingos in Celestún every year which can disrupt their eating habits. Authorities have introduced regulations to limit the numbers of tourists, says Koob, adding that it’s too early to know if the caps will be sufficient.

Now, Koob is back in Yucatán, staying in his childhood holiday home in Chuburná, photographing the wetlands. This time, horseshoe crabs are his focus, and he hopes he can continue to draw more attention to the wildlife and communities living there.

“For most people, the wetland is like a stinky, dark, creepy place. But it’s full of wonders – and the flamingo is just one of them,” says Koob.