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Medicine LibreTexts

12.13: Excretion In Birds

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  • Birds’ high body temperature and level of activity means that they need to conserve water. Birds therefore do not have a bladder and instead of excreting urea, which needs to be dissolved in large amounts of water, birds produce uric acid that can be discharged as a thick paste along with the feces. This is the white chalky part of the bird droppings that land on you or your car.


    • Ruth Lawson (Otago Polytechnic; Dunedin, New Zealand)