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    Cassowary casques act as thermal windows

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    Name:
    Eastick et al. 2019 Scientific ...
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    Author
    Eastick, Danielle
    Tattersall, Glenn
    Watson, Simon
    Lesku, John
    Robert, Kylie
    
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    URI
    http://hdl.handle.net/10464/13983
    Abstract
    Many ideas have been put forward for the adaptive value of the cassowary casque; and yet, its purpose remains speculative. Homeothermic animals elevate body temperature through metabolic heat production. Heat gain must be offset by heat loss to maintain internal temperatures within a range for optimal performance. Living in a tropical climate, cassowaries, being large bodied, dark feathered birds, are under thermal pressure to offload heat. We tested the original hypothesis that the casque acts as a thermal window. With infrared thermographic analyses of living cassowaries over an expansive range of ambient temperatures, we provide evidence that the casque acts as a thermal radiator, offloading heat at high temperatures and restricting heat loss at low temperatures. Interestingly, at intermediate temperatures, the casque appears thermally heterogeneous, with the posterior of the casque heating up before the front half. These findings might have implications for the function of similar structures in avian and non-avian dinosaurs.
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41598-019-38780-8
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    Biological Sciences

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