(1) What is a chela?
Answer: A pincer or nipper (such as on a crab or crayfish).
(2) What is the bag-shaped body (containing hearts and other organs) of an octopus called? (bonus: how many hearts does an octopus have?).
Answer: Mantle (bonus: three).
(3) What is a clitellum?
Answer: The saddle-like ring (usually light coloured) on the body of worms and leeches.
(4) On what kind of animal will you find coverts?
Answer: A bird.
(5) What is a pizzle? (bonus: what used to be made out of pizzles).
Answer: Penis, especially of a bull (bonus: whips).