Dr. Dominic Evangelista

Yeah, they use spiracles.

They will expand and contract their abdomen to bring air in and out of their abdominal spiracles, which are little holes at the sides of their bodies.

Except for their genitalia, which are fantastic.

So, yeah, cockroaches have the males have these really complex and ornate genitalia that are asymmetrical.

So cockroaches, like most other animals, are bilaterally symmetrical, but their genitalia are totally different on the left and right.

There's like a part for hooking the female and preparing her.

for the rest of the genitalia to go in.

There's a part that looks like this complicated three-dimensional clamp-like structure.

There's another part that usually has a series of spines that may be used for scraping out sperm from previous mating events.

Oh, dear.

Some parts that might be like a mating plug.

There's so much variability in genitalia.

There's really very little we know about how they actually work.

I think people should make art based on cockroach genitalia.

They're so ornate.

I don't get the bad at walking thing.

I think they're pretty good at walking.

Okay.

And yeah, they are super fast.

So maybe if someone saw a cockroach that's bad at walking, that may have been a beetle.