Best part is they leave the nest your house to find water.
Rats in ceiling cavity.
The rats take them back to their nest have a feast then get seriously ill over the next few days.
Ceilings and the roof which provide a chance to set traps.
The man hole cover has been examined resealed and thames water have also had a look to see if there are any cracks in the pipework they found nothing.
If you have rats in the ceiling walls or attic of your apartment you may find evidence of this behavior.
You can put them in travel paths toss them in to ceilings or drop them down walls.
If your home has no crawl space or attic space and the rats are in the tiny area between shingles and drywall you will.
Rats can chew their way through.
Set traps inside any drop ceilings and at points like plumbing and heating penetrations where mice can exit the ceiling in the same way as in step 2.
Rats in the ceiling can be difficult to trap and remove especially if your home is one of the few that lacks a proper attic.
There is one very good reason why you do not want rats in the cavity walls and it is the same reason why you should not use rat poison.
Rat teeth leave ragged holes in wood drywall and plastic.
Unfortunately i have had a decomposing rat in my attic.
Rats can be heard at night in the kitchen and bedroom area.
Go to bunnings and get some of those blue wax rat bait blocks.