Most pigeons you encounter on a city street do not have truly red eyes, but a reddish tint is often visible. The standard wild-type pigeon iris is classified as “orange,” and that orange can shade anywhere from pale yellow to a deep red-orange depending on how densely blood vessels show through the tissue. Domestic breeds expand the palette further, displaying pearl-white and dark brown irises, all governed by just two regions of the pigeon genome.
The Three Eye Colors of Pigeons
Pigeons of the species Columba livia produce three common iris colors. The first, called “orange” or “gravel,” is the ancestral wild type. These eyes look bright and warm-toned, but the exact shade ranges widely from a washed-out yellow to a saturated red-orange. What pigeon fanciers call a gravel eye is really a spectrum, and the reddish end of that spectrum is the closest thing pigeons have to a “red” eye. The second iris color is “pearl,” which appears white or pale with faint pink and reddish tinges. The third is “bull,” named for its resemblance to dark bovine eyes, and it ranges from deep chocolate brown to nearly black.1PubMed Central. Two Genomic Loci Control Three Eye Colors in the Domestic Pigeon (Columba livia)
If you watch a flock of feral pigeons, most will have some version of the orange eye, since that is the ancestral state. Pearl and bull eyes are far more common in domesticated breeds that have been selectively bred for particular traits. So the short answer to whether pigeons have red eyes is that some do look strikingly red, but it is a matter of degree, not a separate eye color category.
Where the Redness Actually Comes From
The reddish and pinkish hues in pigeon eyes are not created by a red pigment. All the red and pink color visible in both orange-type and pearl-type pigeon eyes comes from blood vessels running through the outer iris.2PubMed Central. The genetics and evolution of eye color in domestic pigeons (Columba livia) In an orange-eyed pigeon with a dense network of blood vessels near the iris surface, the eye looks distinctly red. In a pearl-eyed pigeon whose iris is otherwise nearly white, the blood vessels lend the eye a pale pink or rose cast. This is why people sometimes describe certain pigeon eyes as “red” when the underlying pigment arrangement is actually orange or white. The blood supply to the iris varies between individual birds, and denser vasculature simply makes the red more prominent.
This mechanism is somewhat similar to why albino animals of many species have pinkish or reddish-looking eyes. Without pigments to mask them, blood vessels show through. In pigeons the principle is the same, though most pigeons are not albinos. Their eyes contain actual pigments layered on top of and around the blood supply, producing the final color the observer perceives.
The Pigments That Build Pigeon Eye Color
Beneath the blood vessels, pigeon irises contain two classes of non-melanin pigment in the iris stroma. One class is guanidines, crystalline deposits of guanine that are whitish and opaque. The other is pteridines, which are yellow-orange. A pigeon with orange or gravel eyes has both guanidine and pteridine pigments present together. The pteridines supply the warm yellow-to-orange base color, and the guanidines add a reflective, slightly pale quality.1PubMed Central. Two Genomic Loci Control Three Eye Colors in the Domestic Pigeon (Columba livia) Early work on pigeon iris pigmentation confirmed that guanine is a major component of the iris in both orange and white-eyed birds, with at least two yellow fluorescent compounds tentatively identified as pteridines present only in orange-eyed birds.3PubMed. Observations on the pigmentation of the pigeon iris
Pearl-eyed pigeons retain the guanidine deposits but have lost the yellow-orange pteridine pigment. Without it, the stroma looks white, and the only warm color comes from the blood vessels behind and within it, giving the characteristic pearl look with its pink-white shimmer. Bull-eyed pigeons have lost both types of stromal pigment entirely. With no guanidine and no pteridine obscuring the deeper tissue, the melanin-rich pigment epithelium at the back of the iris shows through unobstructed, making the eye appear dark brown or almost black.1PubMed Central. Two Genomic Loci Control Three Eye Colors in the Domestic Pigeon (Columba livia)
Two Genes, Three Eye Colors
Genetic research has pinpointed the mutations responsible for the pearl and bull eye colors. Pearl eyes trace to a single nonsense mutation in a gene called SLC2A11B, which is a solute carrier gene. The mutation introduces a premature stop signal in the gene’s coding sequence, effectively breaking the protein it encodes. Researchers validated this mutation in a large sample: all orange-eyed pigeons carried at least one working copy of the gene, while the vast majority of pearl-eyed individuals were homozygous for the broken version, consistent with a recessive pattern of inheritance.2PubMed Central. The genetics and evolution of eye color in domestic pigeons (Columba livia) That means a pigeon generally needs two copies of the mutant allele for pearl eyes to appear. A bird carrying one working copy and one broken copy still looks orange-eyed.
The downstream effect of breaking SLC2A11B appears to involve the disruption of pteridine-producing cells in the iris. Transcriptome analysis of iris tissue from pearl-eyed and orange-eyed pigeons found that GCH1, a gene encoding a rate-limiting enzyme in the pteridine production pathway, was expressed at roughly one-third the normal level in pearl eyes. Another gene involved in the development of pteridine-containing pigment cells, CSF1R, was also significantly reduced.4PLoS Genetics. The genetics and evolution of eye color in domestic pigeons (Columba livia) Without this cellular machinery running properly, the yellow pigment never forms, and the iris defaults to its pale guanidine-only state.
Bull eye color maps to a different genetic region that includes a gene called EDNRB2, known for its role in the migration and development of pigment-producing cells derived from the neural crest.1PubMed Central. Two Genomic Loci Control Three Eye Colors in the Domestic Pigeon (Columba livia) When this pathway is disrupted, the pigment cells that would normally populate the iris stroma with both guanidines and pteridines fail to develop or function, leaving only the melanin behind the iris to determine the eye’s appearance. What makes pigeons especially useful for studying eye color genetics is that all three of these iris types segregate within a single species, which is unusual.
How Domestication Reshaped Pigeon Eyes
Orange is the ancestral eye color, the one pigeons carried before humans began breeding them thousands of years ago. Pearl eyes, by contrast, appear to be a product of domestication. Evolutionary analysis of the SLC2A11B mutation estimates it originated roughly 5,400 years ago, a timeframe that aligns with the earliest evidence of pigeon domestication. Researchers detected a signal of positive selection around this gene, suggesting that humans were actively choosing pearl-eyed birds for breeding.2PubMed Central. The genetics and evolution of eye color in domestic pigeons (Columba livia)
The pearl eye has been a classic judging criterion in pigeon shows for centuries. Breeds like the Show Homer, Runt, and Trumpeter are expected to display pearl eyes as part of their breed standard. Breeders selecting for this trait over many generations concentrated the recessive SLC2A11B mutation in these lineages. Bull eyes are also found predominantly in domestic breeds and are favored in certain racing and tumbler varieties. Wild rock pigeons, the feral birds you see in cities, overwhelmingly retain the ancestral orange eye.
This is a good example of how selective breeding can spread a trait that would have little survival advantage in the wild. A pearl-eyed pigeon sees perfectly well, and there is no evidence that the mutation affects anything other than iris color. But without human selection pressures, the recessive mutation would remain rare in a free-breeding population, as it does in feral flocks descended from escaped domestic birds.
Eye Color Changes with Age
One thing that catches people off guard is that pigeon eye color is not fixed from hatching. Young pigeons, called squabs, typically have dark eyes that lighten as they mature. A bird that will eventually have bright orange or gravel eyes may start life with irises that look muddy brown or grayish. The pigments in the iris stroma take time to accumulate, and the blood vessel network becomes more visible as the bird grows and the iris thins. Pigeon fanciers who breed for particular eye colors are well aware that final eye color may not be apparent until the bird is several months old.
This age-dependent shift exists in many bird species, not just pigeons. A review of avian eye color variation noted that eye color often serves as an indicator of age across birds more broadly, and that several hypotheses suggest it plays a role in signaling between members of the same species, particularly as a marker of maturity or mate quality, though few of these evolutionary hypotheses have been directly tested.5Ibis. The mechanistic, genetic and evolutionary causes of bird eye colour variation Whether this applies to pigeons in a functional sense is unclear. Feral pigeons are not known to use eye color as a courtship signal the way some raptors or parrots appear to. But the developmental timeline means that if you are trying to identify a pigeon’s eye color, looking at a young bird can be misleading.
Pigeon Eyes in the Context of Bird Eye Diversity
Pigeon eye color research has been unusually productive compared to work on other bird species, partly because pigeons breed readily in captivity and come in such a wide range of domestic varieties. But the pigments involved are not unique to pigeons. A broad review of avian iris pigmentation found that bird irises use melanin, carotenoids, purines, and pteridines as coloring agents, with different species relying on different combinations.5Ibis. The mechanistic, genetic and evolutionary causes of bird eye colour variation Pigeons are notable for relying heavily on purines (the guanidine deposits) and pteridines rather than carotenoids, which are the pigments responsible for the vivid yellow and red eyes of many other birds like owls, herons, and some songbirds.
This distinction matters because carotenoid-based eye colors depend on diet. A bird that gets carotenoids from the food it eats can have brighter or duller eyes depending on nutritional status. Pigeon iris color, by contrast, is largely genetic and structural. A well-fed pigeon and a poorly fed pigeon of the same genotype will have essentially the same eye color, because pteridines are synthesized internally rather than absorbed from food. The blood vessel contribution to redness might vary slightly with health and blood flow, but the base color is set by genetics, not nutrition.
Common Misconceptions About Pigeon Eye Color
A few misunderstandings circulate about pigeon eyes, especially online. The most common is the flat claim that “pigeons have red eyes.” As covered earlier, truly red-appearing eyes exist at one end of the orange spectrum, but calling red the standard pigeon eye color misrepresents the range. Most feral pigeons have eyes that read as orange or amber to a casual observer, not red.
Another persistent belief is that eye color in pigeons indicates health or temperament. Pigeon racing enthusiasts have long debated whether certain eye colors or patterns correlate with racing ability or intelligence. There is no scientific support for these claims. Eye color in pigeons is determined by the presence or absence of specific pigments and is controlled at well-characterized genetic loci. It has no demonstrated connection to behavior, stamina, or disease resistance.
A third misconception, more common among people unfamiliar with pigeons, is that a pigeon with red or pink-tinged eyes is an albino. True albinism in pigeons is extremely rare. A pearl-eyed pigeon with a visible pink tinge from blood vessels is not albino. It has normal melanin in its feathers, beak, skin, and the pigment epithelium behind its iris. The pale eye comes from missing stromal pigments, not from a systemic lack of melanin.
How Pigeons See the World
The color of a pigeon’s iris is, from the bird’s perspective, irrelevant to how well it sees. What matters for pigeon vision is the photoreceptor and oil-droplet system inside the retina, behind the iris. Pigeon retinas contain at least four types of visual pigment and five types of oil droplet, which together act as a set of color filters that give pigeons a broader range of color sensitivity than humans have.6Vision Research. The visual pigments, oil droplets and spectral sensitivity of the pigeon These oil droplets sit in front of the photoreceptors and selectively filter wavelengths of light before they reach the pigment, sharpening the pigeon’s ability to distinguish between closely related colors.
Pigeons can see into the ultraviolet range, which humans cannot. This gives them access to visual information that is invisible to us, from subtle differences in feather iridescence to variations in food ripeness. The upshot is that while we spend time categorizing pigeon eye color in human terms like “orange” or “pearl,” the pigeon itself is perceiving a richer visual world than we are. The irony is thick: the creature whose eye color we puzzle over has better color vision than we do. And to another pigeon, the difference between a yellow-orange iris and a red-orange one might be far more visually obvious than it is to us, simply because their visual system can resolve finer color distinctions in that part of the spectrum.