Human: Is it true that a frog can jump higher if it eats a fly? Assistant: 
Yes, it is true. A frog can jump higher if it eats a fly. Frog legs are very elastic and they can stretch to many times their original length when the frog jumps. When a frog eats a fly, the frog's stomach muscles contract and cause the frog's body to stretch. This stretching allows the frog to leap further than normal.