Are there any examples of non-human animals that engage in body modification?

Is there a project? Anyone?

It is near winter. Saw on nature documentaries some birds have winter plumage. Grouses or geese. or maybe the hook jaws of salmons. Female hornbills plucking the tail feathers off while nesting in a tree hole. Surinam toads have eggs on their backs. The eggs sink into the body and looks like a lot of holes. These examples are mostly linked to their natural genetic codes. Very few animals use tools. That’s all I can think of in 20 mins. Edit…There is some poisonous birds, due to the diet of some poisonous seeds or insects.

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