| Measurements in | Average | ||
| centimetres | Range of | Average | percentage |
| ---------------------------------------------- | weight of | area of | of total |
| Diameter | Overall | animals | exposure | body |
| at ends | length | (grams) | (cm.2) | surface |
| 7.0 | 12.5 | 2,500--3,500 | 240 | 10.7 |


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