Peep! Peep! Peep! What’s that high-pitched sound? What you’re hearing is the mating call of a spring peeper—a tiny frog, about an inch long, that lives near lakes and marshes. You can hear them in early spring at The Morton Arboretum in the east woods along the Heritage Trail (near parking lot 13). The peepers, like many frogs, spend the winter partly frozen. When they warm up in spring, they start looking for love. How does a frog find a mate? He sings. Read more: bit.ly/2QHCCIQ | The Morton Ar