Abstract
1. 1. Caloric density of whole adipose tissue and lipids extracted thereform were determined by bomb calorimetry using five avian species. Whole tissue from the interfurcular region had a lower caloric density (6·0–9·1 kcal/g) than did the lipid extract (9·0–9·4). 2. 2. Adipose tissue lipids from pre- and intramigratory individuals had mean caloric densities of about 9·1 kcal/g. Postmigratory individuals usually had lower values of about 8·8 kcal/g. Premigratory values were also higher (9·2) in long-distance migrants than in short-distance intracontinental migrants (9·0). Values obtained during the summer months were the lowest of all seasons, ranging from 6·5 to 8·8. 3. 3. At the time of energy-demanding flights many birds have maximum adipose tissue depots containing the highest seasonal percentage of lipids and highest caloric densities.
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