Whooping Crane

About the whooping crane

The whooping crane is named for its loud, carrying call, and it is the tallest bird native to North America. Along with the sandhill crane, it is one of only two crane species found on the continent. Adults are white with a red crown and a long, dark, pointed bill; their legs and neck are dark as well. In flight, a whooping crane holds its long neck straight out and trails its legs behind it, and its black wing tips become visible against the white body. Young whooping cranes look different from adults, wearing a cinnamon-brown plumage until they mature.

The species was formally described in 1758 by Carl Linnaeus, who based his account on illustrations by two English naturalists working from birds observed and collected in North America. It was originally placed with the herons in the genus Ardea before later being grouped with other cranes; some records list it as Antigone americana, while the older and still widely used name is Grus americana. There are no recognized subspecies.

On average, the whooping crane ranks as the fifth-largest crane species in the world, and on its home continent it is the tallest bird and among the heaviest, third to fifth depending on the measurements used. Males average about 16 pounds (7.3 kg) and females about 14 pounds (6.2 kg), though individual adults can range from roughly 10 to 19 pounds (4.5 to 8.5 kg). Body length from bill tip to tail averages about 4 feet 4 inches (132 cm). Few other North American birds come close to this size and color combination — the great egret is a foot shorter and a fraction of the weight, and the similarly pale great white heron and wood stork are both at least 30 percent smaller. The larger sandhill crane can approach a whooping crane in size but is gray rather than white, which makes the two easy to tell apart at a glance.

Behavior and diet

Whooping cranes forage by walking through shallow water or fields and probing the ground or water with their bills. They eat more animal matter than most other cranes; only the red-crowned crane is thought to be more carnivorous among living crane species. On their Texas wintering grounds, they take crustaceans, mollusks, grasshoppers, fish such as eel, small reptiles, mice, voles, aquatic plants, acorns, and fruit. Blue crabs are especially important there, making up as much as 90 percent of the birds' energy intake in some winters, according to studies spanning 1946 to 2005. On their breeding grounds farther north, they add frogs, small rodents, small birds, minnows, aquatic insects, crayfish, clams, snails, and berries to the mix. Waste grain such as wheat, barley, and corn also matters to migrating birds, though whooping cranes digest grain less efficiently than sandhill cranes because they do not swallow gizzard stones.

Pairs are known for a "unison call," performed jointly after waking, after courtship, and while defending territory, along with separate "guard calls" that warn a partner of danger. These calls travel for miles and are distinctive enough that researchers can identify individual birds and pairs by analyzing recordings of them, a technique that has shown some pairs stay bonded to the same territory for years while others change partners and territories over time.

Nesting happens on the ground, typically on a raised spot in a marsh. A female lays one or two eggs, usually in late April or May, and both parents incubate them for 29 to 31 days, with the female doing more of the direct care. Even when two eggs hatch, usually only one chick survives the season. Parents keep feeding their young for six to eight months, and the family bond generally lasts about a year before the young bird is on its own. Predators of eggs and young include black bears, wolverines, gray wolves, cougars, red foxes, and ravens, while bobcats have killed many reintroduced birds in Florida and Texas — causing the great majority of natural deaths among whooping cranes in Florida — and golden eagles have killed some fledglings.

Range and habitat

Whooping cranes once ranged across the midwestern United States and south into Mexico. By the mid-20th century, the only natural breeding population left was nesting in the muskeg of Wood Buffalo National Park in Alberta and the Northwest Territories, Canada. That population still winters along the Texas Gulf Coast near Rockport, at the Aransas National Wildlife Refuge and surrounding bays and peninsulas, making the round trip between the two countries every year. The Salt Plains National Wildlife Refuge in Oklahoma is an important stopover along the way, hosting an estimated 60 to 75 percent of the species during migration.

Conservation efforts have since reestablished cranes outside that single route. A reintroduction project has cranes nesting again in Wisconsin, the first time the species nested naturally there in a century, and a separate non-migratory population has been established in Louisiana. A similar attempt in Florida did not take hold, and it has been discontinued due to high adult mortality and habitat loss.

Conservation status

The whooping crane is listed as Endangered on the IUCN Red List, in a 2020 BirdLife International assessment. Its population is believed to have always been naturally small, but unregulated hunting and the loss of wetland habitat pushed it to the edge of extinction — from an estimated 10,000-plus birds before European settlement, to 1,300–1,400 by 1870, to just 15 adults in the single migratory flock by 1938. A 1940 hurricane scattered a small non-migratory population in Louisiana, and its survivors never bred again in the wild. By 1941 only 21 wild birds and 2 captive birds remained.

Recovery has come through hunting bans, habitat protection, public education, and captive breeding. The Whooping Crane Conservation Association formed in 1961, and the species was formally declared endangered in 1967. Captive breeding began with a female named Josephine, the last survivor of the Louisiana population, and produced the first captive-born chick in 1950. Researchers later found that wild pairs rearing two eggs would typically only fledge one chick anyway, so removing one egg from certain nests for captive rearing did not reduce the wild population's success. As of 2025, the total whooping crane population — the migratory Aransas–Wood Buffalo flock, the two reintroduced flocks in Wisconsin and Louisiana, and birds in captivity — is just over 830, up from a low that once threatened the species' survival entirely. Illegal hunting still occurs despite hunting bans and the threat of significant fines and prison time.