10. Humans. It's what's for dinner.
Currently, we humans sit comfortably atop the food chain. Or so we like to think. There are five trophic levels in our ecosystem to determine how we all measure up. Level 1 is the bottom (think plants and algae) and Level 5 is the top (think apex predators like tigers.)
Without our technology and superior thinking ability, humans really aren't all we're cracked up to be. Unlike actual apex predators, we're omnivores with an apex predator-complex. Based on a variety of studies, humans score at a 2.21—right around anchovies and pigs. You know, pizza toppings.
What would happen if the animals decided that it was time for change?
Watch Zoo on CBS to find out.