How to get wild Napa animals out of the attic.
The first stage to getting rid of any uninvited guests that are now living in your attic is to of course find out exactly who and what they are because depending on who and what they are will govern your course of action to evict them. You do the assessment and you find out exactly what you are dealing with, if it is early spring the odds are you're dealing with a single Napa animal and it is a female, she either has just had babies or is nursing. The fact you are dealing with a female complicates the issue because if she has already had her babies you cannot trap the mother and leave the babies to die, in most jurisdictions that is actually a criminal offense under the animal cruelty acts.
If you decide to trap the Napa critter then you have a second problem on your hands, if you relocate most animals you are sentencing them to a slow death, they know their home range or they are territorial animals or in the case of squirrels, their food stash which is going to get them through the winter is in the area you trapped them. Before you decide that trapping is too hard and therefore you are going to bait the animals and poison them I would again check with your local authorities because in a lot of jurisdictions poisoning of wildlife is prohibited, also is just plain dangerous to your pets and any other pets around the area plus any small children that happen to be close.
Depending on how they operate you can call your local California animal control and a for a minimum fee or even at no cost will come and trap the animal and remove it, but they will definitely euthanize the animal. If the animal happens to be dangerous, like a rattlesnake, the local animal control is required by law to come and remove the animal at no charge to you. If you are sure you know what is living in your roof then you need to do a full inspection of the outside of the house as a prelude to issuing eviction notices, you must find all of the ways and openings that the animals are using to get into and out of the attic.
One of the ways professionals get rid of a lot of Napa animals, especially nocturnal ones is by setting up bright lights in the attic on motion sensors, as soon as the animal enters the attic the lights come on and chase it away, it generally gets the idea pretty quick, problem solved.
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