A Cuckoo Application?

Every hour, on the hour, my Macbook Pro does this annoying Cuckoo thing. I have no clue what it is! I want it to stop! I'm new to using Macs so I have no clue what's going on. I think I've had this laptop for almost 2 months now and it only started doing that recently(within the last month). I think it may be an application, but no applications that I have (that I know of), have any sort of alarm. Please, someone help me with my crazy cuckoo clock computer!

Go to System Preferences > Date & Time, and see if the "Announce the time" check box has been checked. If it is, uncheck it.

I already tried that and I have it set to having no alarm go off. It still cuckoos, but the strange thing is that it will start cuckooing at about 5 usually and will go every hour until the computer is shut down. Sometimes though, it'll start earlier than that and keep going every hour.