You’re Bugging Me
Calling an excellent thing “the bee’s knees” was one of many youthful terms for impressive things that began during the American Roaring Twenties. Many of them were animal related, such as “the cat’s pygamas,” “the cat’s meow,” and “the snake’s hips.” An earlier 18th century use of the term indicated something that doesn’t actually exist. However, if you don’t mind calling the joints between bee leg segments “knees,” then bees’ knees exist in great quantity. A honeybee has six legs, each with many joined segments.
You may not want a “nitpicker” around to criticize your minor faults, but you might if you had lice. The word literally means one who picks off nits, the tiny eggs of lice, fleas, and other insects.
The black widow spider gets its name because the much-larger female of the species sometimes eats her partner after mating.