First thing in the morning, when the sun has barely peeked over the horizon and you want to snuggle under the covers, the loudest animals in the world (well, in your world) are probably your cat yowling and your dog begging for breakfast. We don't dispute that.
However, scientists have measured the sounds made by animals in the wild, and they, too, are very, very loud. Maybe even louder than your pets first thing in the morning, but probably not. However, we're just saying that there are animals that can create sounds so loud they could burst our human eardrums. Not even your cat can do that, though she may try.
Before we dive in, let's look at what qualifies as loud for humans' ears.