Once upon a time, animals were absolutely enormous. As humans and other predators began to roam the earth, animals began to decrease from their once colossal sizes. Nowadays, you can find giant animals mostly on islands, where animals live in isolation from humans and their impact. They are able to grow to their full size thanks to a lack of predators and because they have greater access to more resources, like food and water. While you would expect animals this big to eat a lot of food, many of them actually eat the same amount of food as their regular size counterparts. Dinosaurs may no longer be in existence, but there are still some modern-day monsters, say you will, that are roaming our earth.