Fer-de-lance, San Cipriano Reserve, Colombia

Colombia's most notorious snake, above all because it is often found near human settlements. Over the years, we've encountered this viper three times. Never did it show any active aggression, rather a defensive irritation due to the meeting itself. Still, it's not a snake to joke around with. There's a major difference between seeing one as a visitor and having one in your backyard, with pets and young children around.