Darter (Anhinga novaehollandiae)

Darters' feathers are not waterproof, and since they are underwater hunters you will usually see them sitting out of the water on a log or rock with their wings spread right out drying themselves. Their feathers are permeable to water to allow for decreased buoyancy, so they can sink to catch their prey. They have an oil gland at the base of their tail which they use while preening and squeezing the water from their feathers.

See www.australiazoo.com.au/our-animals/amazing-animals/birds...

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