In this short video, National Geographic's "Crittercam" team attaches a camera to the shell of a giant river turtle in Brazil, then researchers narrate the video from a turtle's-eye view.

If you look closely, at first you'll see dozens of much smaller turtles swimming beneath this giant one, then an encounter with a sort of bug-eyed, Elmo-looking turtle. That encounter is what researchers are studying—how do these giant adult turtles interact with their hatchlings?