Probably not animal porn, but definitly some type of creature porn.
"Oustalet’s chameleons mating; the much larger tan colored male is on top. It’s typical for males to be much bigger than females in this species."
Some stuff to keep occupied with until I have time/internet to find something exciting. The second comment, about the Polygyrid snail sounds awesome. I’m googling it now!! Also, trans-species threesomes???
So, you said you want to know about how hummingbirds mate? Well all right, males dont have a penis. Instead of penetration there is a cloacal kiss which transports the sperm from the male to the female.