Why these desert birds are actually more like gulls than traditional waders

Nature · Published 3 October 2026 Swipe more like this →

In short: Coursers are masters of the arid landscape, known for their long legs and insect-hunting speed. While they were long grouped with plovers, modern genetic analysis has upended their family tree, revealing a surprising evolutionary connection to gulls and terns. Discover the hidden biology behind these elusive, ground-dwelling birds.

The subfamily Cursoriinae, commonly known as coursers, represents a specialized group of birds within the family Glareolidae. Unlike their relatives, the pratincoles, coursers are physically adapted for life in harsh, arid environments. They possess distinct morphological features, including elongated legs, shorter wings, and slender, downward-curving bills. These traits facilitate their primary hunting strategy: running across the desert floor to capture insects, rather than relying on flight or wading in water.

For years, ornithologists classified coursers as waders, assuming a close evolutionary relationship with plovers. However, recent genetic studies have challenged this traditional taxonomy. Researchers now place coursers and pratincoles within the suborder Lari, suggesting they are more closely related to gulls and terns. Their closest living relative is identified as the crab-plover, a finding that shifts our understanding of how these birds adapted to life away from the coast.

Survival in open, desert habitats requires more than just speed. Coursers rely on cryptic plumage to blend into their surroundings, allowing them to remain unseen by predators. When threatened, they exhibit a characteristic behavior of crouching low to the ground to enhance this camouflage. This instinctual response is a vital defense mechanism in regions where cover is scarce. Today, nine distinct species are recognized across three genera, including the bronze-winged courser, the three-banded courser, Jerdon's courser, and the double-banded courser.

This taxonomic reassessment highlights the power of genetic evidence in refining our view of avian evolution. By moving away from purely physical observations to molecular analysis, scientists have uncovered a lineage that connects desert-dwelling runners to the gulls of the sea. Understanding these relationships is essential for grasping the broader history of the order Charadriiformes and the diverse ecological niches its members have occupied over time.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• Why these shorebirds hunt insects on the wing like swallows instead of wading
• Why some birds fly halfway across the globe without stopping for a single break
• Why these ground-dwelling birds are not actually related to their Old World lookalikes
• Why these drab songbirds are evolving toward a life on the ground
• Why the birds in your backyard are ancient survivors of the dinosaur age
• The South American crab-eating fox is neither a true fox nor a crab specialist
• The Coua: Madagascar's enigmatic cuckoos that build their own nests and hunt on foot
• The crested caracara is a tropical falcon that walks like a vulture
• Did this massive, barrel-shaped Permian herbivore spend its life on land or underwater?
• Why do these penguins lay two eggs only to discard the first one?
• Why the cottontail rabbit is a master of survival despite being everyone's favorite snack
• The Ginsu shark was a Cretaceous apex predator that could slice through marine giants.

More in Vertebrates · More in Nature · Latest · A–Z · All topics