The birds are most vocal in the breeding season, and a couple may call in duet, or several birds may call in concert.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: The birds are most vocal in the breeding season, and a couple may call in duet, or several birds may call in concert. ### Response: .