Quick Guide to Chew Cards for Halo Households

Chew cards are safe, easy and fun way of finding out whether you have predators like mice, rats, hedgehogs, possums and stoats active in your back yard. Chew Cards can help you work out where to locate your traps, and can help us work out how many predators there are in Wellington. Plus it is a great activity for the kids!

Here are a few guidelines on how to use them, with thanks to Andrew Sinclair at Whakaupoko Landcare.

bitehammerLabelling & Location

Label Chew Cards with eg your name and individual card number (if you have more than one).

Fold the card in half and pierce with a 50 – 75mm flat head nail so the top flap sticks out at approx. 45⁰ angle

Attach to trees / fences etc, approx 30cm (one foot, about a hammer length) above ground level.

(NB: Avoid locating on fence lines with electric wires as some pests avoid electric fences).


Spacing and places to locate Chew Cards. 

  • Place Chew Cards on your property at 25m intervals.
  • Make sure some Chew Cards are located close to your house or other buildings



  • Leave Chew Cards in place for 7 days (1 week).
  • Avoid placing the chew cards out when rain is predicted. Predators tend to not forage as much on nights when it is raining after sundown.
  • Best placed at a time of the year when feed levels are usually quite low eg July / August


Chew Card Bite Marks





Angle teeth marks. Squeeze out peanut butter

Stoat / Hedgehog / Cat 

Puncture marks


Bite out entire sections of card


Smaller sections chewed out with only one layer of corflute

Interpreting, confirming and recording results