My cat ate an owl (or tried to, a small owl)...and is sick now

he ate mostly the head... brought it to the front sidewalk

later that day i noticed he was lethargic, and not eating like usually.

then he proceeded to lay down on the stairs inside the house for 2 straight days, then, got up and used the restroom (incredibly stinky) in the house (he never uses the restroom inside unless he's sick)

... finally today he moved from the stairs to a spot on a couch.. slowly he started moving around a little bit this evening, ate, drank water... he's definitely getting better.

i wonder what in the world in that owl made him so sick lol.. it's crazy because as soon as i realized he'd killed an owl and brought it up, that he'd messed up somehow rofl..(i know the esoteric value of the owl figure) (and cats aren't supposed to kill owls, usually goes the other way around)(owls are carnivores)

lol it's funny because on my own life journey recently, i've "eaten an owl" so to speak..

I work in IT security,...and needless to say, lately i've had to learn some rather.. nefarious, new, types of exploits/subversions... (had to learn them to learn how to defend against them) (i'm white hat these days strictly)