infared camera for mice?
An infrared camera might be useful if you were trying to detect or document rodent/pest activity. If you know you already know you have mice, rats, and (maybe) a squirrel, focus on getting them out and preventing them from entering. These questions/solutions might be of some help:


How can I get rid of a mouse in my house?
How do I find where mice are entering my house?
How can I figure out where squirrels are entering my attic?


Alternatively, you could contact an exterminator, who can handle the removal and entry prevention for you.