Even the meeting of lips can become an aggressive act in the animal kingdom. When humans come lip to lip, the result is a tender kiss, but this is not so for all animals. Some creatures throw mouths ...

Slugs may look like they are fighting in videos seen online, but it is actually an intense mating ritual. Slugs can mate with anyone within their own species, as they have both male and female ...

Slugs don’t seem like the type of animals capable of duking it out. However, a funny Instagram post by @tiny.sanctuary shows what appears to be a fight between two particularly aggressive slugs. But ...