Here’s where it gets fun (and by “fun,” I mean mildly terrifying): a single female German cockroach can produce up to 400 offspring in her lifetime. That’s not a typo. From one egg case, you can get a small army in a matter of months.
So when you see one, you’re not looking at a “stray” roach. You’re looking at a poster child for a hidden population. Unless you live in a place where roaches are seasonal tourists—like, say, a swamp—that one is never alone.
I know what you’re thinking: “But maybe it was a wanderer from outside! Maybe it’s lonely!” Oh, bless your heart. Roaches don’t get lonely. They get crowded.
Are There Exceptions? (Spoiler: Not Really)
Okay, fine, there are rare exceptions. If you see a big, lumbering American cockroach (the kind that flies—yikes) in the middle of winter, it might have just crawled in from a sewer. That’s a “wanderer,” and you might only have one or two.
But if you see the small, light-brown type (German cockroaches) in a warm, humid spot? Game over. That’s the roach equivalent of a mall Santa—he’s a decoy for the real operation happening in the back room.
Is it true if you see one roach there are more? - The Daily Insight
Here’s a quick rule of thumb: for every roach you see in the open, experts estimate there are 20 to 50 more hiding. They are master ninjas. They only come out when they think you’re asleep, and only when their hiding spot gets too crowded.
