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Regulation of Heat Exchange across the Hornbill Beak: Functional Similarities with Toucans?

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Academic year: 2017

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Fig 1. Measurements taken from Southern Yellow-billed Hornbills ( Tockus leucomelas ) to calculate surface areas for estimates of heat transfer.
Table 1. Surface area, percentage of total surface area and characteristic dimensions for heat transfer calculated for Southern Yellow-billed Horn- Horn-bills ( Tockus leucomelas )
Table 3). At T s _ beak -T a threshold T a (~30.7°C), T s _ beak -T a was maximised and heat was
Fig 4. Thermal images of a female Southern Yellow-billed Hornbill ( Tockus leucomelas ) at different air temperatures
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