During the breeding season, many songbirds begin their dawn chorus well before sleepy campers crawl out of their tents. But if you hear a bird singing loudly (perhaps annoyingly) in the middle of the night, it’s likely to be the northern mockingbird. Skilled mimics, mockingbirds put together long, complex songs by combining imitations of other bird species (and sometimes non-avian sounds). The birds continue adding new sounds to their repertoires as long as they live. Males, which sing more often and louder than females, may learn some 200 different songs during their lives.