Biology behind a monster that is able to remain invisible

This is a post-apocalyptic setting I'm working on. The world has been overrun by invisible monsters from another parallel universe. They can be heard and smelled, and they can form claw prints on the ground - but they are invisible.

How would the science behind this work? One idea I've seen before is that they are able to bend all the light around themselves, but that would effectively make them blind as no light would reach their eyes (although, I feel like this might make for an interesting twist where the creature hunts by using vibration/echolocation)

What are some other possible mechanisms that might allow these creatures to be invisible?

posted over 4 years ago

Space_Cadet‭

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