In every single case of a snake in the attic, the attic also had a heavy rat infestation. Thus the snakes are probably following the scent of rats into the attic, looking for food. People ask me whether or not snakes are looking for a good place to nest in an attic. It's true that many mammals like to have a litter of young in a warm, safe, attic, but I'm not sure about snakes. I have observed just one case in my lifetime in which a snake laid a clutch of eggs in a house. The occupants caught 27 baby Yellow Rat Snakes in their home over a period of two months, so I must conclude that a large adult Yellow Rat Snake laid eggs either in the attic or somewhere in the house. This event is rare, and this specie of snake is completely harmless.

I went into the attic of this home, which was full of rats, and lo and behold, found a Yellow Rat Snake going about its business. I quickly grabbed both the
snake and my camera, and took this photo.

When I got out of the attic, I had the homeowner take this photo for me. He actually suspected he had a snake in the attic, because he heard odd "circular
slithering noises" up there, and he had an "eerie feeling" about his attic. And oh yeah, he added, the previous night he observed the snake had crawled down
the wall, poked its head out of a hole, and gone back up.
You can also catch snakes in the attic with a special trap, by clicking below:

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