No one becomes wise who is sure he already is. Too many people quit looking for work when they find a job. During World War II, a special army unit began training bats to carry bombs into cracks and crevices of enemy buildings. The war ended before the project was ever put into operation. The tough, dried, twisted string used today in making violin strings, tennis racket strings, strings to thread looms, and thread for surgical stitches called catgut is not made from a cat's gut.
Most catgut is made from the intestines of sheep and hogs.
These intestines are cut into long ribbons, then cleaned and dried. Next they are spun into string and then polished. Caterpillars have very poor eyesight and can see only light and dark. An elephant's trunk has no bones, but does have 40,000 different muscles. The number of feathers on birds varies greatly from one kind to another.