How do barn owls sweat?

Birds do not sweat. They release heat via panting, not unlike dogs. They will also hold their wings away from their body. Baby raptors, especially owls, have a lot of down for the first few weeks and can become very hot in warm climates. This is one reason it is so important, if you have a barn owl nesting box, to clean it out of pellet debris every year between late Oct. and late Nov. A build up of debris in an owl nesting box will cause higher tempertures during times of extreme heat.