Stork

Last updated: November 20, 2021
Verified by: AZ Animals Staff

They can’t sing like other birds.



Stork Scientific Classification

Kingdom
Animalia
Phylum
Chordata
Class
Aves
Order
Ciconiiformes
Family
Ciconiidae

Read our Complete Guide to Classification of Animals.

Stork Conservation Status


Stork Facts

Prey
Insects, amphibians, small mammals, bird eggs, fish, crustaceans.
Fun Fact
They can’t sing like other birds.
Estimated Population Size
700,000+
Biggest Threat
Agricultural changes and industrialization by humans.
Most Distinctive Feature
long legs, long neck, and long bill
Wingspan
Up to 10.5+ feet
Incubation Period
33-34 days
Litter Size
1-7 eggs
Habitat
Open grasslands, light woodlands, marshes, wet meadows, rivers, ponds.
Predators
American alligators, though eggs are attacked by small mammals.
Diet
Carnivore
Type
Bird
Common Name
Stork
Number Of Species
19
Location
Australia, North America, Africa, Europe, Asia, South America
Average Clutch Size
1
Nesting Location
Cliff sides, trees, and on tops of homes
Age of Molting
11 months
Migratory
1

Stork Physical Characteristics

Color
  • Red
  • Black
  • White
Skin Type
Feathers
Top Speed
16 mph
Lifespan
22 years in wild, 35 years in captivity
Weight
6.2 to 7.3 lbs.
Height
39-49 inches
Length
39-45 inches

Stork Images

Click through all of our Stork images in the gallery.

A Stork hunting by the river.
Black stork (Ciconia nigra) fishing on the lake.
A beautiful white stork flies past some woodland.
Black and white woolly-necked stork in green grass.
White storks with young baby storks on the nest.
Flying stork isolated on white background

View all of the Stork images!



The stork is a bird that is filled with whimsy and wonder, often wrapped into the story of life.

However, these birds are much more than a symbol of a new arrival; they are found in the hundreds of thousands around the world, residing primarily in Europe until the breeding season is over. Even with 19 different species, the identification of this bird is notable for its white, black, and gray feathers and long legs.

3 Amazing Stork facts!

Here are a few fun facts about these wading birds.

  • There are 19 species of storks, and they have a lifespan of 30+ years.
  • The marabou stork is the largest of all of these species, weighing 20 lbs. with a wingspan of 12 feet. The smallest, on the other hand, is the hamerkop, which only weighs 17 ounces.
  • Identification is rather easy, since they stand so tall and primarily have white, black, and gray feathers.

Where to Find Storks

Most native species of storks come from Europe, and only one species – the wood stork – is even located in the United States. They prefer habitats with wetlands and marshes, giving them easy access to their preferred foods. Since they migrate towards the equator during autumn and winter, they are easiest to spot in the summertime atop buildings or near trees where they build their massive nests. They return after the coldest months have passed in February, March, and April, and the presence of their nests is meant to be a good omen.

Stork Nests

Females build their large nests during the breeding season once a year, which is typical during the summer. To accommodate the large eggs (which are almost 3 inches in widths and weigh nearly 7 ounces), the nest is about 3.3 to 6.6 feet deep and 2.6 to 4.9 feet wide. Since these birds are so broad, their nest can weigh anywhere from 130 to 550 lbs. once it is built.

The nest is constructed by both members of the mating pair, and other birds (like sparrows and common starlings) will use the nest when the pair leaves.

Stork Scientific name

The stork, which covers 19 species in total, is part of the Aves class in the Ciconiidae family. They are broken down into six different genus categories, which include:

  • Mycteria, which includes the milky stork, yellow-billed stork, painted stork, and the wood stork.
  • Anastomus, which includes the Asian and African openbills.
  • Ciconia, which includes the Abdim’s stock, woolly-necked stork, storm’s stork, manguari stork, oriental stork, white stork, and the black stork.
  • Ephippiorhynchus, which includes the black-necked stork and the saddle-billed stork.
  • Jaibiru, which only includes the bird by the same name.
  • Leptoptilos, which includes the lesser adjutant, greater adjutant, and the marabou stork.

The name “Ciconiidae” comes from two words – “Ciconia” and the suffix “-idae.” Ciconia is Latin, literally meaning “stork.” “Stork,” however, goes back to a Proto-Germanic word – “sturkaz” – which refers to the bird’s rigid posture.

Stork Appearance

The appearance of this bird will largely depend on the species. For the most part, all of these wading birds have long legs and a thick body that resembles a sturdy football. They also have a long bill and a long neck. White storks have white bodies with black feathers along their wings, though the wood stork has a grayer appearance to their wings.

The wingspan varies between the species, but the only species found in the United States stretches about 44 inches from one side to the other. The largest wingspan of is 9.4 feet. The average stork weighs up to 7.4 lbs.

A Stork hunting by the river.
A Stork hunting by the river.

Stork Behavior

The life of this bird is solitary, choosing to live alone unless it is breeding season. Some species choose to live in groups when they aren’t breeding, while others will live within a flock for their entire life. Their group behavior seems to change from one bird to the next.

Rather than tweeting a song like other birds, the call is a clattering noise made with their bill. Some people compare the sound to that of firing off a machine gun. These calls vary with what the bird is trying to communicate.

Stork Migration Pattern and Timing

Migration occurs throughout the year for the white stork. Leaving behind their summer breeding ground, they will flock towards Africa by the end of September on a journey that takes about 26 days. They won’t go north again until the spring, which takes about 49 days. They often have much more access to food and water during the trek back.

Stork Diet

These birds generally maintain a carnivorous diet, though the selection of what they eat is considered opportunistic. They seek out food on the ground, even from other nests. Low-laying vegetation often has many of the foods that they’ll eat, though their beak also allows them to catch food from shallow waters.

What Do Storks Eat?

These birds tend to eat whatever is around them, though their prey is quite small. The majority of their diet is comprised of frogs and toads, fish, rodents, earthworms, mollusks and crustaceans, insects, and tadpoles. Sometimes, they will go after the baby chicks or eggs of other birds.

Stork Predators, Threats, and Conservation Status

Part of the reason that it survives for so long is that this bird doesn’t have many predators. The eggs are at a much greater risk of being eaten by small mammals and birds. Instead, changes in agriculture and the continued industrialization of their wetland homes by humans are a much greater threat than that.

What Eats Storks?

While this wading bird is far from an apex predator, but their large size protects them from others. On occasion, American alligators will go after the wood stork, but the eggs typically entice other predators. Animals like striped skunks, vultures, corvids, and grackles use the eggs as nutrients, but the location of their nests puts the eggs in a prime spot for being stolen by raccoons.

Stork Reproduction, Young, and Molting

The average clutch size is between 1 and 7 eggs, and the female typically lays eggs once a year in a large nest. Often, the best habitat for this nest is in wetlands, between trees, or on manmade buildings.

The incubation period of the eggs starts from the moment that the female lays the egg, taking about 33 to 34 days until hatching. The strongest hatchling is typically the one born first, and the weaker baby (or babies) sometimes are killed by the parents due to their reduced likelihood of surviving after leaving the nest.

These birds molt as early as two years old, though the majority of white storks do not breed until they are four years old. The longest lifespan in the wild is 39 years, though there are some in captivity that has lived up to 35 years.

Stork Population

In the entire world, experts estimate that there are as many as 704,000 individuals, as of 2015. Europe seems to be where the majority of these storks are found, accounting for approximately 447,000 to 495,000 individuals. Though these birds used to be found in China as well, they have been extinct in the region since 1980.

At this point, industrialization and the change in agricultural methods have both caused a decline in populations. Their current conservation status is largely “not extinct,” though the reduction in wetland habitats led it to be listed as an endangered species until about 40 years ago. In the United States, they have a “threatened” status, which is why the wood stork is specifically protected by the U.S. Migratory Bird Treaty Act. Currently, the IUCN considers this bird family to be “least concern.”

View all 143 animals that start with S

Stork FAQs (Frequently Asked Questions) 

When does a stork bite go away?

A stork bite takes quite a while to go away after birth, sometimes taking 18 months to heal if the mark is on the face. However, if the “bite” is on the back of the neck, it is often permanent.

What is a stork?

Identification of a stork is easy! A stork is a wading bird with long legs and a long bill. They are typically white and black, though there are 19 different species are recognized today.

Do storks throw their babies out of the nest?

Sometimes, though the idea that they flippantly throw their babies from the nest is based on facts. Storks, like many animals, will not support their chicks if their survival is questionable. They want to raise baby chicks that will continue their species, and they inherently filter out the weakest of their hatchlings.

On occasion, the chicks will also fall out of the nest without being thrown, but they are unable to make it back.

Sources
  1. Giraffa, Available here: https://www.giraffa.co/white-stork/
  2. Wiktionary, Available here: https://en.wiktionary.org/wiki/Ciconia
  3. Just Fun Facts, Available here: http://justfunfacts.com/interesting-facts-about-storks/
  4. Animal Corner, Available here: https://animalcorner.org/animals/white-stork-birds/
  5. Wikipedia, Available here: https://en.wikipedia.org/wiki/White_stork
  6. Fort Wayne's Children Zoo, Available here: https://kidszoo.org/our-animals/white-stork/

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