I reckon these would creep up on you when you're camping in marshlands. You hear a whistle, but see nothing, then before you know it they've scurried up the side of your sleeping bag and they've laid their 12 eggs inside your ear.
Usually the eggs hatch within 4 hours, but only one at a time, scientists have never figured out why or how this happens. Meaning if all the eggs were successful you've got as much as 48 hours of squeezing out Ducklets from your ear canal.
Ducklets are made from duckling heads and chick toes.