Greater Sandhill Cranes

Greater Sandhill cranes are the only subspecies that nest in Washington, in the Glenwood Valley near Mt. Adams. Conboy Lake National Wildlife Refuge provides habitat for the majority of these birds. Breeding greater Sandhill Cranes disappeared from Washington in the 1940's but reappeared in 1972 when two cranes were seen on Conboy Lake NWR. Nesting on the refuge was confirmed in 1979 when one pair produced eggs; however, no fledglings were produced. Since then the number of breeding pairs has increased to 20-25 on the refuge, with 4-5 additional  breeding pairs on other lands in the Glenwood Valley.

Lesser Sandhill Craens

Of the 650,000 Sandhill cranes worldwide, lesser Sandhill cranes—the cranes on Columbia NWR—are the most numerous subspecies, with a population of approximately 450-500,000. Most of those can be found in the Mid-Continent population, which winters in New Mexico, Texas and northern Mexico. Those are the cranes that famously congregate by the thousands along the Platte River in Nebraska as they head north to breeding grounds in Canada, Alaska and eastern Siberia.

Around 35,000 lesser Sandhill cranes follow the Pacific Flyway, coming through eastern Washington during their spring and fall migrations, stopping over on Columbia NWR and the Hanford Reach National Monument. These cranes winter in the southern portion of California's Central Valley and pass through on their way to nesting sites in the Matanuska River Valley and Bristol Bay areas of south-central Alaska.

Let's learn about lesser Sandhill cranes. Read on.

A Striking Bird

The different subspecies of Sandhill cranes vary greatly in size and weight. Lesser Sandhill cranes are the smallest, weighing on average about 6-7 pounds and standing 3-3.5 feet tall. At the other end, greater Sandhill cranes are the largest subspecies and average 4.5-5 feet tall and 10-14 pounds. Canadian Sandhills are intermediate in size. Body plumage is characterized by varying shades of gray. The forehead and crown are covered with reddish skin. The face, chin, upper throat, and nape are white to pale gray. Adults have a white cheek patch. Legs and toes are black. In general, males and females are virtually indistinguishable, but within a breeding pair, males tend to be larger than females. Juvenile plumage changes from cinnamon brown to gray as the bird matures during the first year. In many locations, Sandhill cranes preen iron-rich mud into their feathers, creating a deep rusty brown hue which lasts through spring and summer.

A Bird Of Wetlands

Sandhill cranes are primarily birds of open fresh water wetlands, but the different subspecies utilize habitats that range from bogs, sedge meadows, and fens to open grasslands, pine savannas and cultivated lands. Sandhill cranes occur at their highest breeding density in habitats that contain open sedge meadows in wetlands that are adjacent to short vegetation in uplands.

A Bird Of Incredible Flights

Sandhill cranes can fly from 15 to 50 miles per hour, depending on wind speed and direction. They circle skyward on rising columns of warm air-called thermals-to help them gain altitudes of up to 12,000 feet! Generally, however, they migrate at altitudes of less than 5,000 feet. When migrating, Sandhill cranes may average 150 to over 400 miles a day, usually during daylight hours when helpful air currents are strongest. (The Cuban, Mississippi and Florida subspecies of Sandhill cranes are non-migratory.)

A Bird Of Loyalty & Family

Sandhill cranes begin breeding between two and seven years of age. They are perennially monogamous, that is they "mate for life." However, if the mate dies, the survivor will choose a new mate, but mating success often depends on how many breeding seasons a pair has been together. One reason is that pairs need to practice being parents together to successfully raise young. They exhibit extended bi-parental care of young, with families staying together for up to a year. Cranes "dance" to attract mates. Although it is commonly associated with courtship, dancing can occur at any age and season. Dancing is generally believed to be a normal part of motor development for cranes and thwarts aggression, relieves tension and strengthens the pair bond. Mated pairs of cranes engage in unison calling, which is a complex and extended series of coordinated calls. While calling, cranes stand in an upright posture, usually with their heads thrown back and beaks skyward during the display. 

A typical crane nest is a low mound of vegetation, usually located in a wetland. Females usually lay two eggs, and incubation by both sexes lasts 29-32 days. The male takes the primary role in defending the nest against possible danger. Both parents incubate and feed the chicks throughout the pre-fledging stage, which is typically 67-75 days. Juvenile cranes are called colts. The single, most important factor regulating crane populations is habitat availability. Nesting effort and success, as well as survival of young, correlate directly with the amount and quality of nesting habitat.

Want more Sandhill crane trivia? Here's a link to our Sandhill Crane Fact Sheet. Much of this article originated with it.