That's what happens when you buy a cat frufru food.

My cats get a ghetto diet of whatever crunchies are on sale and table scraps. I know... left to their own cat devices... they would be eating garbage from dumpsters, carrion, and live rodents or insects from the midden heap. Also having lived very rural... bird flus are pretty common in cats... not just from eating them... but from us humans tracking a lot of bird poop into the house on the soles of our feet.

If you keep a birdfeeder...

I wish I had the immune system of a cat...