You're right. They do see beyond the "visible" light spectrum. Many animals do....and many cannot see in color. The extra light spectrum is how prey creatures like deer can see to wander through yards/and wilderness at night. They have to be able to see well enough to run if the predators (wolf pack, mountain lion, etc) decide to stalk them at night. It's also how rodents (rats/mice) see to come out and torture @Ponypoor on camera. The infra-red spectrum light the cameras use to allow the limited vision of human eyes to see in the dark provides enough light they can see their surroundings easily. Of course good senses of smell and hearing help with that....
Sheesh! U mean I am torturing my chickens?!!! Yea gads!
 

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