Note: This is the official answer to the riddle: The Rock and Roller
Hello, dear friends.
The previous riddle was cracked by Daisy the Curly Cat, followed by Colin, Deimos Tel`Arin, Wan Kong Yew, and Selene.
Yes indeed, the crocodiles eat stones and rocks and keep them in the stomach, and the stomach muscles can move the stones in such a way as to help digestion (must come in handy when they eat bones 
).
See you soon.
