Tuesday, January 31, 2017

Sandhill Cranes Flying and Calling

Sandhill Cranes graceful flight closeup and dinosaur-like calls and rattles on the ground. Threatened in Florida, but conspicuous due to their huge size and loud calls there is a year-round resident population (Florida Sandhill Crane). However, these birds may be part of the migratory Sandhill Cranes that arrive each winter from around the Great Lakes and hangout in freshwater marshland and wide expanses of field and rangeland.

Sandhill Crane: Grus canadensis

Sandhill cranes (Grus canadensis) are long-legged, long-necked, gray, heron-like birds with a patch of bald, red skin on top of their head. Cranes fly with necks outstretched like geese, whereas herons fly with necks tucked in on their backs. For positive identification, look for reddish skin on top of the crane's head.
Two subspecies of sandhill crane occur in Florida.  The Florida sandhill crane (G. c. pratensis), numbering 4,000 to 5,000, is a non-migratory year-round breeding resident.  They are joined every winter by 25,000 migratory greater sandhill cranes (G. c. tabida), the larger of the two subspecies. The greater sandhill crane winters in Florida but nests in the Great Lakes region. Sandhill cranes nest during late winter and spring on mats of vegetation about two feet in diameter and in shallow water. 
Two eggs are normally laid. Cranes are monogamous breeders. Within 24 hours of hatching, the young are capable of following their parents away from the nest. Together, they forage for seeds and roots, crop plants such as corn and peanuts, insects, snakes, frogs and occasionally young birds or small mammals.
Cranes are quite omnivorous  feeding on seeds, grain, berries, insects, earthworms, mice, small birds, snakes, lizards, frogs, crayfish, but do not "fish" like herons.
Resident sandhill cranes are usually seen in very small groups or pairs.  In November and December, however, large flocks of northern cranes move in, more than doubling the population in the state and then leave during March and April.  The sandhill crane is a close relative to the nearly extinct whooping crane, which is being reintroduced into the state. Young sandhills weigh about twelve pounds, males are larger than females, but external markings are identical. Cranes live to be older than most birds, some reaching 20 years old.

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Sandhill Cranes Flying and Calling