Final answer:
A chain schedule that requires a bird to first peck at an illuminated key and then pull a chain in order to receive reinforcement would be called a Tandem chain.
Step-by-step explanation:
A chain schedule that requires a bird to first peck at an illuminated key and then pull a chain in order to receive reinforcement would be called a Tandem chain. In a tandem chain, a specific sequence of behaviors must be performed in order to obtain reinforcement. This type of reinforcement schedule is often used in behavior analysis studies to manipulate and observe the effects of different contingencies on behavior.