I've got the creepy crawlies just reading about those critters -
Try living in a house where they gallop through the attic all night.... Tracks up the walls outside where they climbed up the patio posts... I know rat tracks and paths when I see em.
I had a couch in my planter infront of the front window... Dog couch... on hot days they would lounge out there in the shade. So now I am down to one dog... my Rosie... I saw rat tracks on the couch and new omg..... So I tipped it over to look under neath and about four ran out of the couch. Rosie was an Austrailian shepherd and greyhound mix... She killed every one of them.... Two hard shakes and one more for good measure and I would tell her to drop it .... she ran and got the other two and killed them for me... Then she saw one more but it dived into a hole in the planter.
I said..."Get em Rose..." and pointed at the hole. I swear she moved a good yard and a half of dirt digging out five nests... Killing everything that moved. When shed start in on the Pinkies I told her to leave it.. and Id scoop up the nest of babies Eyes un opened... and put them in a bucket.... If you leave just one theres a chance that a female who lost their nest will take care of it.
By the time we were done she had killed ten Rats Mostly juveniles but two of those were full grown adults. And about thirty pinkies.
Rosie earned every dog bisquit and treat she ever got just from that episode. i put out poison after that...
But eveidence of just one rat or mouse means no less than five or ten more that are "elsewhere".
Just one female rat can have seven to ten litters a year each litter can number up to 14.... and they are able to reproduce by the time they are 4 weeks old.
Adult males can reach eighteen inches long including the tail. So when i say bedroom slipper size I am not kidding.
I get the creepy crawlies when i think about them as well.
http://www.fcps.edu/islandcreekes/ecology/norway_rat.htm
deb