Question: how do you know if there are rats in your garden?
Answer: Rat Droppings. Tend to be found concentrated in specific locations as rats produce up to 40 droppings per night. ... 
Rub Marks. Rats use established routes along skirting boards and walls due to their poor eyesight. ... 
Gnaw Marks. ... 
Rat Holes. ... 
Rat Nests. ... 
Footprints.