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  4. Biosecurity: Rat or mouse?

Biosecurity: Rat or mouse?

If you are in an area where we’ve removed rats and suspect that you’ve seen a rat, please report this online or call 0800 NO RATS (0800 667 287). It’s better to be safe than sorry! Learn how you can support our work.

How can you tell a young rat from a mouse?

Young or baby rats and adult mice can look very similar. Generally, young rats have bigger features compared to their body size and look slightly out of proportion. This includes bigger feet (‘clown feet’), head, ears and also a thicker tail. In comparison, for mice, their feet, head, ears, and tail look proportionate to their body size.

Mice are not one of our target species. If you want to remove mice, you can purchase a couple of low-cost mouse traps (supermarket or hardware store ones work well) and place them next to the fridge – just follow the instructions.

Read a PDF of this information.

Learn more about our work to remove all rats, stoats, weasels and possums from Wellington.

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© 2026 Predator Free Wellington • Privacy statement • Website by RS

  • Home
  • Our project
    • Our project
    • News
    • FAQs
    • Knowledge hub
    • Meet our team
    • Our impact
    • Our progress
    • Our supporters
    • Contact us
  • Sign up – Phase 2
    • Phase 2
    • Phase 2 volunteering
  • Miramar
  • Trapping
    • Find a trapping group
    • Community heroes
    • Knowledge hub
      • Our urban predator free blueprint (2024)
      • Most Significant Change (2025)
      • Return on investment (2025)
      • The value of volunteers (2024)
      • Habitat preferences of Ship rats (2023)
      • Social-ecological research (2022)
      • People, nature and wellbeing (2020)
      • Predator Free Miramar: How to kill rats and engage a community (2019)
      • Biosecurity: Rat or mouse?
      • Biosecurity: Rat or wētā droppings?
      • Biosecurity: Chew marks and chew cards
      • Biosecurity: Tracking tunnels and prints
      • How to get trapping (guide)
      • How to build a trapping tunnel
      • How to rat proof your compost
      • How to make a wētā hotel
      • How to build a corflute trapping tunnel
      • H2Zero trial – case study
      • Improving our biosecurity – case study
      • Using dog detectors early – case study
      • How to maintain your Victor rat trap
      • How to run a tunnel building workshop
      • Conceiving an unfenced urban ecosanctuary at Mātai Moana (2024) – external link
      • Estimating the impact of Predator Free Wellington on tree wētā (2025) – external link
      • Assessing the effects of predator control and habitat on lizards in an urban landscape (2025) – external link
      • Webinar - Analysis of Predator Free Wellington data from Miramar (2024)
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