Were two animals. Or anthropomorphic animals engage in sexual activities together such as sex. There is a range of animals that are used. Some people also use it as money while others just masturbate to some of the pictures. There are tons of different styles and postures and attitudes that are used in the pictures. There are many types from straight, male and female. To gay and lesbian ones as well.
And for example of what could be used in a story.
Teen boy: I found a wolf fucking another wolf.
Friend: Wait- In sexual activities?
Teen boy: Yeah I masturbated to some and felt horny.
Friend: You know what that is right?
Teen boy: Furry porn.