What physical traits define the stork family?

Ciconiidae species share a large, heavily built body, very long legs suited to wading and walking across open ground and shallow water, a long, straight, often stout bill adapted to seizing rather than spearing prey, and broad, powerful wings built for efficient soaring flight over long distances rather than fast, agile maneuvering.

How do storks differ from herons, which they are often confused with?

Storks fly with the neck held fully extended forward rather than folded back into an S-shape as herons do, generally build much larger and more permanent stick nests often placed on buildings or other elevated structures, and largely lack the loud vocal calls typical of herons, relying instead on bill-clattering and other non-vocal displays for communication.

Why do many stork species rely so heavily on soaring flight during migration?

Because of their large size and heavy body weight, sustained flapping flight over very long distances would be extremely energy-costly, so many stork species, the white stork included, migrate primarily by soaring on rising columns of warm air, or thermals, that form over land, a strategy that concentrates migrating birds along specific overland routes and largely avoids extended open-water crossings where thermals do not form.

Bird Atlas

Ciconiidae

Storks (Ciconiidae)

shortCiconiidae

The stork family: massive, long-legged wading birds with long straight bills, epitomized by the white stork's huge rooftop nests and dramatic overland migration to Africa.

What makes Ciconiidae a family

Ciconiidae, the stork family, comprises around 19 species of large, long-legged wading birds found across much of the world, unified by a heavily built body, very long legs, a long, straight, sturdy bill adapted to grasping rather than spearing prey, and broad, powerful wings suited to efficient long-distance soaring flight. Storks are among the largest flying birds regularly encountered across their range, and their size, combined with a striking largely white-and-black or dark plumage in many species, makes them conspicuous wherever they occur.

A defining behavioral trait across the family is the near-total reliance on non-vocal communication, particularly bill-clattering, since adult storks of most species have only a limited capacity for loud vocal calls compared with many other large waterbirds, making bill-clattering displays and postural signals central to nest-site greeting and territorial communication.

Distinctive traits across the family

The white stork, the sole species covered so far in this atlas, illustrates several traits shared broadly across the family: an exceptionally large, reused, and often expanded stick nest, frequently placed on an elevated human structure such as a rooftop or utility pole, a diet dominated by amphibians, large insects, and small vertebrates hunted by walking and probing across open ground and shallow water, and a migration strategy built almost entirely around soaring flight over land rather than sustained flapping.

Flight posture is another useful family-wide identification trait: storks characteristically fly with the neck extended fully forward rather than folded back, a clear visual distinction from the superficially similar herons that share some of the same wetland habitat but belong to a separate, unrelated family.

Species in this family

This atlas currently covers one member of Ciconiidae: the white stork (Ciconia ciconia), a massive white-and-black wading bird famous for its enormous rooftop stick nests, its non-vocal bill-clattering displays, and one of the most dramatic overland migrations of any large European bird, traveling to winter across sub-Saharan Africa. Further Ciconiidae species native to the atlas's covered regions will be added to the catalogue over time.

Where and when to watch this family

Open wet meadows, marshes, and farmland close to villages or towns with tall, stable nesting structures are the most reliable places to find this family, with the best viewing typically from spring through late summer, when breeding storks are actively tending nests and can often be observed foraging on nearby fields and wetlands. Late summer and early autumn additionally offer the chance to see large soaring flocks gathering ahead of and during migration, particularly at traditional overland crossing points.