The Hungry Ones is a Metasphere level in Ecco: The Tides of Time. In this level, you become a shark.
Guide[]
You should spawn in this little cave with a Glyph saying, "Sometimes to beat your enemy, you must become your enemy." When you get out of there, you will see a Metasphere and a ton of sharks. Touch the Metasphere to become a shark and swim across the area without taking any damage. At some point you'll come across an area with tons of dolphins that don't know you're Ecco.
You can also eat Jellyfish if you want to, but that doesn't serve much of a purpose.