What has ears but cannot hear?
Why this joke works
Corn Ears Without Hearing
In farming, an “ear” is the part of a corn plant that holds the kernels. In anatomy, an ear is the body part associated with hearing. The riddle makes “has ears” fit both definitions, then uses “cannot hear” to keep attention on the anatomical meaning until the answer arrives. A field works especially well because it contains many ears of corn, satisfying the plural wording without needing an animal or person.
A closer look
How to give listeners room to solve it
This works as a compact guessing riddle, so ask it plainly and resist hinting at a farm. Leave a longer pause than you would for a one-line pun; listeners need time to test possible animals and objects. If the group needs help, say the answer can be found outdoors without naming the crop. Once revealed, the image of many corn stalks makes the answer easy to remember and retell.
Fact behind the joke
Every potential kernel has its own silk
A corn ear is the plant’s female flower structure. Each strand of silk connects to one ovule, which can become a kernel after pollination. Purdue Extension reports that an ear may form as many as 1,000 potential kernels, though typically only 400 to 600 develop through harvest. That hidden one-silk-to-one-kernel system gives each “ear” far more structure than its compact shape suggests.