Rats are highly adaptable animals capable of changing their behaviour to survive in challenging environments.

During colder months, the search for food, water and secure shelter can bring rats closer to homes and buildings. Roof cavities, wall spaces and other protected areas can provide attractive nesting locations.

Rat behaviour can also be influenced by some unusual biological factors. One particularly fascinating example involves the parasite Toxoplasma gondii, which has been studied for its potential effects on rodents' natural responses to predators.

Let's look at the science, the seasonal pressures that bring rats closer to homes, what attracts them to properties and the warning signs of an infestation.

The Parasite That Can Alter Fear Responses in Rats

Rats naturally display avoidance behaviours toward predators such as cats.

Research involving Toxoplasma gondii has found that infection can alter some fear-related behaviours in rodents.

How Does It Work?

Toxoplasma gondii can form cysts within the tissues of infected rodents, including the brain.

Studies have investigated behavioural changes that may include:

• Reduced avoidance of predator-associated scents
• Changes in fear and risk-related behaviour
• Altered responses to cat odours

These behavioural effects may increase the likelihood of an infected rodent encountering a cat, which can assist the parasite in completing its life cycle.

While fascinating, this phenomenon doesn't mean that rats entering your home have necessarily been infected with the parasite. More ordinary factors such as access to food, water and shelter are much more useful when assessing why rats are around a property.

Why Rats May Enter Homes During Winter

As outdoor conditions become colder and resources change, rats may seek protected environments that provide:

• Warmth
• Shelter
• Food
• Water
• Suitable nesting locations

Residential properties can provide several of these resources at once.

Common Rat Behaviour Around Homes

You may find rats:

• Moving closer to areas where food is stored or prepared
• Following food sources from bins, pet bowls and compost
• Climbing trees, fences and structures to reach roofs
• Entering through gaps around roofing, eaves and vents
• Nesting in protected roof cavities and other undisturbed spaces

What Attracts Rats to Your Property?

Rats are opportunistic. A property that provides easy access to food, water or shelter can become attractive to them.

Common attractants include:

• Fruit and nut-bearing trees
• Fallen or overripe fruit
• Pet food left outdoors
• Unsecured rubbish bins
• Compost
• Accessible outdoor water sources
• Clutter and wood piles
• Dense vegetation
• Gaps around roofing, eaves and vents

Trees and Vegetation Around the Home

Trees and dense vegetation close to a building can provide rats with food, shelter and potential routes towards the roof.

Palm trees can provide protected areas and fibrous material, while fruit and nut-bearing trees can provide readily available food when produce falls to the ground.

Keeping vegetation maintained and removing fallen fruit or nuts can help make the area around your home less attractive to rodents.

Where Do Rats Nest?

Once rats gain access to a building, they generally look for protected and relatively undisturbed areas.

Roof cavities can be particularly attractive because they may provide:

• Protection from weather
• Quiet, undisturbed spaces
• Insulation and other potential nesting material
• Access through nearby trees, gutters or structural gaps
• Proximity to food and water elsewhere around the property

Rats can enter through surprisingly small openings, which is why inspecting potential entry points is an important part of rodent management.

How to Detect Rats in Your Home

Rats are often most active when the household is quiet, so you may hear or notice evidence of them before actually seeing one.

Common Signs of Rat Activity

Watch for:

• Scratching or scurrying sounds, particularly at night
• Droppings in cupboards, pantries or along walls
• Gnaw marks on timber, wiring or food packaging
• Greasy marks along frequently travelled surfaces
• Disturbed or shredded insulation
• Nesting material
• Unusual activity from household pets
• Persistent unusual odours in enclosed areas

Scratching or rapid movement in a ceiling or roof cavity can be an early indication of rodent activity and is worth investigating.

What Should You Do If You Suspect Rats?

Rodent control isn't simply about dealing with the rats you can see. Identifying how they're accessing the property and what is attracting them is an important part of managing the problem.

Practical measures can include:

• Keeping food securely stored
• Removing fallen fruit and nuts
• Keeping rubbish bins closed
• Avoiding leaving pet food outdoors
• Reducing clutter around the property
• Maintaining vegetation near the building
• Identifying potential entry points
• Arranging professional assessment and treatment when required

Addressing both the infestation and the conditions encouraging rodent activity can help reduce the likelihood of the problem continuing.

Don't Ignore the Signs of Rodent Activity

Rats can contaminate areas with droppings and urine and may damage materials by gnawing. Electrical wiring can also be damaged by rodent activity.

If you're hearing scratching in the roof, finding droppings or noticing other signs of activity, it's better to investigate the problem rather than wait for it to become more established.

Need Help With a Rat Problem?

Clean Carpets and Pest Control Perth provides professional rodent control services throughout the Perth area.

If you suspect rats are living in your roof or around your property, contact our team to arrange an assessment and appropriate rodent-control treatment.