Los Angeles County, Los Angeles Rat Control Situation:
Hi David, I'm in southern California. I have at least one rat in my ceiling, maybe two or more. I've read your website and really appreciate the great insight you're providing. Based on your advice, I've caught 3 rats around the outside my house (over the last 2 months), trimmed trees back (3 days ago), and plugged all the access holes I could identify (3 weeks ago).
Yet I still have at least one rat in my attic. Though I've place several snap traps (baited with peanut butter and bird seed) in the attic, I get no nibbles. I also cannot find any evidence of their paths. I've moved the trap several time with no success. From inside the house, I hear them in sections of the attic (about 3:00 am) that are completely inaccessible to me (because of firewalls.)
So I hired a pest extermination company. For $275 they put some poison bait stations outside, and three snap traps in the attic that are baited with a beef jerkey substance. The traps are near the attic access panel - not near the rat noise activity. The guy's reply was that the scent would lure them. He also reviewed my hole-plugging and said it was fine. He didn't get onto my roof. It's been three days and I check the snap traps in the morning and around dusk each night.
My questions are:
1. Is it safe to assume that the rat(s) sleep in my house during the day and at night they are coming and going outside? Does this mean I've missed an access point?
2. Considering the inaccessibility, is it common to drill a hole in the ceiling (like a 4" hole for recessed lighting) to place traps in the attic for those inaccessible places? If I drill a hole, then I can stick a camera up there and take pictures to look for evidence, place the traps, monitor them, etc. But then I've got a hole to deal with.
3. Is it worth parking myself on the roof and patiently waiting to see where the rats are coming and going?
4. Have I given the beef jerkey snap-traps enough time to do their thing? Any other advice? Thanks for your help!
Los Angeles Rat Control Tip of The Week
What Are The Mating Habits Of The Black Rat And Norway Rat?
Black Rat
The ship rats have a polygamous mating framework, where a single male mates with various females. As a rule, the prevailing male is a successful breeder. These rats mate from March to November. The development or conception period goes on for 21 - 29 days, yielding 3 - 5 litters of 1 - 16 young (with a normal or average of 7) every year. Children of this species are brought into the world altricial. Their eyes open just at 15 days old, while hairs show up before the end of the nursing period. The young ones are weaned, and become independent at 3 - 4 months of age.
Norway Rat
Norway rats generally build homes in below-ground burrows or at ground level. Homes might be fixed with shredded paper, fabric, or different stringy materials. Litters of 6 to 12 young ones are brought into the world 21 to 23 days after conception. Baby rats are stripped, and their eyes are shut; however, they develop quickly. They can eat solid food at 2 1/2 to 3 weeks. They become independent at around 3 weeks to about a month and arrive at reproductive maturity at 3 months old, sometimes as early as 8 weeks. Female Norway Rats may come into heat every 4 or 5 days, and they may even mate a day after a litter is conceived. The average female rat has 4 to 6 litters per year and may effectively wean at least 20 offspring every year.