Once I was VERY appetized looking at a large fish swimming in his large tank. It was an expensive fish at some man's house. I couldn't stop staring at that fish, and I just wanted to take it OUT of the tank, kill it, gently steam it and EAT IT UP! It looked like it would be the most moist and delicious fish ever! Looking at that fish made me hungry every time I saw it!
I don't know about for other animals... I know for sure that chickens look gross, yuck.