Graduate Thesis Or Dissertation
 

Plumage development and growth of young whooping cranes

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  • Plumage development and growth were studied in young whooping cranes (Grus americana) from hatching until 450 days of age. The downy stage of the young cranes lasted about six weeks; the development of the juvenal plumage took until 100 days of age, and the molt to the adult or all white plumage was complete at 450 days. At one day the cranes stood 19.0 to 20.5 centimeters in height and weighed 100 to 150 grams. By 40 days they stood 65.0 to 75.0 centimeters and weighed 1,750 to 2,500 grams; by 100 days they stood 100 to 120 centimeters and weighed 4,300 to 4,950 grams; and by 250 days they were nearing adult size and stood 112 to 127 centimeters and weighed 5,700 to 6,700 grams. The weights for each of six cranes were graphically plotted, and a logistic growth curve was determined for each individual. A mean logistic growth curve was computed from the accumulated data. Color changes of the down, contour feathers and other body parts were noted and a key to age identification based on these observations was developed.
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