The phrase Animalus anthropomorphicus is the phrase that Pi's father gives to describe what to him is the most dangerous animal in the entire world, even more dangerous than humans. What is curious about this animal is that it is extremely common and that it is located on every continent and in each country. Pi defines this animal as "the animal as seen through the human eyes." What Pi's father believes is the most dangerous animal is the way that humans perceive an animal which is so innaccurate and dangerous. Pi goes on to explain:
We've all met one, perhaps even owned one. It is an animal that is "cute," "friendly," "loving," "devoted," "merry," "understanding." These animals lie in ambush in every toy store and children's zo. Countless stories are told of them.
The Animalus anthropomorphicus therefore is the animal that humans think wild animals are when we begin to believe that they cannot really be as savage and wild as we think they can be. This is the most dangerous aspect of animals in the world, and this is a lesson that Pi learns forcibly when his father makes him witness a tiger killing a goat.