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document updated a month ago, on Feb 20, 2024

Behavior

What do they eat?

The German cockroach is omnivorous, eating a wide range of human foods, pet food, fruit, leather, and even book bindings.

In the bathroom, they may eat: toilet paper, soap residue, used diapers, trash, and toothpaste. [1]

How is their vision?

They respond to two regions of the spectrum — 490nm, the blue-green area, and 365nm, known as the UV-A region.

I'm guessing they won't respond to the red-ish region of humans' visible spectrum.