Snake traps also work well inside attics.
Animal attic remove.
One of the largest problems with having animals live in your attic is that they poop and pee in your attic.
To get rid of animals in your attic or walls i look for a live catch cage trap with thick wire gauge a heavy duty door and a small amount of moving parts.
Animal poop in the attic.
I bought more than a dozen havahart 1079 traps in my first year of business and all but one of them are still in use today.
If you have rats the entire building must be sealed first and then all the rats trapped and removed.
Scampering noises and missing insulation near the eaves are signs of squirrels.
Some trapping jobs are simple but removal of wildlife from attics is usually an involved process that requires important steps like identification removal of baby animals proper trap or exclusion device setup in conjunction with the sealing of secondary access holes sealing of every last potential hole on the house after the animals are out and biohazard cleanup.
Roof rats aka black rats often build nests in attics.
It is not easy work and there are many important variables removal of critters in the attic requires very specific special knowledge.
Locate the entry points.
Because they need water daily they tend to nest.
For more advanced info read snakes in the attic guide.
Every animal does it of course and many of them will turn your attic into a regular sewer.
The methods vary considerably depending on the type of animal in the attic.