Millions of children have drifted off to sleep at night with stories of “Frog and Toad.” Author and illustrator Arnold Lobel debuted the series in 1970 with “Frog and Toad are Friends.” Three ...

Most female frogs don’t call; most lack or have only rudimentary vocal cords. A typical female selects a mate from a chorus of males and then –silently – signals her beau. But the female concave-eared ...