The excess keratin tends to exfoliate naturally when they're out hunting, scavenging, picking meat from bones etc.
So owl handlers (and many other bird species too) use a dremel / rotary tool to grind away the extra growth
Owls in Towels
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Wildlife rehabilitators often wrap owls so they can be weighed and fed. If not, the owls get in a flap. The result? Loads of pictures of #owlsintowels owlsintowels.org
