Oh I knew about the connection to Mad Cow but I was sure it was a type of Sea Bird One of my Uncle’s GF is an Ornithologist and she gave me several books on birds and I just opened one and found a Fairy Prion

[quote=@BlackPanther]
[@RumikoOhara]
No 

A prion (the bad version) is a mutated protein that's misfolded in the brain. It hits other proteins and creates a strand of mutated badness that turns the brain into a sponge.

In cows it's called mad cow
For people the one from mad cow is vCJD
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