Knee Jerk

My first thought whenever I hear the expression "the bees knees" is do bees even have knees? As it turns out they do have knees of a sort and six of what passes for knees to be accurate. Still after answering that question I wondered why that would indicate something special since bees knees wouldn't be very high unless of course they were flying. From what I found the special thing about bees knees is that it rhymes. It seems to have originated in the 1920s along with "the cat's pajamas","the snake's hips","the kipper's knickers", and "the sardine's whiskers". Only the first two of these are still in popular use today and only the bees knees are actually found in nature.
Another theory suggests that because the nectar and pollen collects on the bee's legs that it means that is where all the sweet,good stuff is collected. Well...Ain't that the bees knees?