Different Types of Rodents in New Zealand

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Different Types of Rodents in New Zealand

If you’ve had the misfortune of recently seeing a rodent in your property, one of the first things you may want to know is what type of rodent you’re dealing with. If you already know you have a rodent issue, get in touch immediately for our professional rodent control service!

We’re here to help! In New Zealand, we have four types of invasive rodents, which are the house mouse, the ship rat, the Norwegian rat, and the kiore. Below, we’ll go through the characteristics of each type so you have a better idea of what you’re dealing with. First, though, we’ll take an overview of rodents as a whole.

What Are Rodents?

Rodents are a type of small mammal, classed as part of the order Rodentia, and include squirrels, hamsters, mice, rats, and guinea pigs. What do all of these have in common? The answer is their teeth.

All rodents have teeth that are specialised for gnawing: these come in the form of sharp upper and lower incisors which are constantly being ground down and so constantly growing so that they stay a consistent length. They’re natural hunters, with keen senses of smell, hearing, and vision.

House Mouse

The house mouse (Mus musculus) is the common mouse, best known for making peoples’ homes their primary food source – being omnivores, they’ll eat just about anything they can get their paws on – but also for their role as prominent laboratory organisms.

You’ll recognize them from their white undersides. Typically, the upper (dorsal) side of a house mouse’s body is dark to light brown and the lower (vental) side is pale brown.

You can tell the difference between a mouse and a rat based on their tail – mice have shorter, hairy tails, whereas rats have long, completely hairless and “scaly” tails.

House mouse

Ship Rat

The ship rat (Rattus rattus) is the most common pest in New Zealand, being found in just about every part of the country. It’s also known as the black rat – a bit of a misnomer as its fur can range in color from grey to black – and the roof rat because it likes to build its nests in high-up roof spaces. This species is a very good climber!

The most distinguishing feature of the ship rat is its very long tail, which stretches out longer than its body. Its ears are also noticeably longer than those of its European cousin, the Norwegian rat.

Ship rat

Norway Rat

The Norway rat (Rattus norvegicus) is more commonly known as the brown rat – you’ll be able to tell it apart from the ship rat by its lightly-colored fur. You might also know it as the water rat due to its proclivity for wet environments.

As opposed to the very long, skinny tail of the ship rat, the Norway rat has a thick tail that is slightly shorter than its (on average) 20 cm long body. Additionally, their ears are short and stubby, unable to cover their eyes if pressed down.

Norway rat

Kiore

Kiore is the Māori name for the Pacific or Polynesian rat (Rattus exulans). Kiore are often confused with ship rats, as their coloring is very similar. One way to tell the difference is by the length of its tail, which is either slightly shorter or slightly longer than its body.

The other most common way to tell a Kiore from a ship rat is by its size: Kiore look like a smaller version of the ship rat. A third way to distinguish Kiore is through its distinctly pale foot.

Kiore

If you’ve seen any of these critters in your home, it’s important to get the situation under control before it has the chance to get out of control. Rodents breed rapidly and cause all sorts of issues – from diseases through to electrical fires or floods. For peace of mind, feel free to give us a call today!

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