Instead, they have specialized feathers called "powder down" feathers. These feathers disintegrate into a fine, powdery substance that the birds use to clean and waterproof their plumage.
Here's how it works:
* The powder down feathers release a fine, powdery substance that the bird rubs over its body with its beak.
* This powder helps to distribute oils produced by the preen gland, which is located near the base of the tail.
* The oils and powder help to waterproof the feathers, keeping the bird dry and insulated.
* They also help to keep the feathers clean and free of parasites.
So, raptors don't have oily feathers, but they do have powder down feathers that help them maintain their plumage.