The Goodnature A24 trap was originally designed for rats — but can it reliably and humanely control house mice too? A peer-reviewed laboratory study tested exactly that question using wild house mice in controlled trials that simulated real-world conditions.
The researchers examined three main factors: how quickly mice died after triggering the trap, whether the trap consistently killed rather than injured mice, and how bait choice and trap positioning influenced effectiveness.
Why Mouse Testing Matters
House mice (Mus musculus) are one of the most widespread pest species in the world. They damage buildings and crops, contaminate food, spread disease, and create ongoing stress for property owners. Most mouse control relies on toxic bait or single-catch snap traps — both of which have limitations.
The A24 is a self-resetting, CO₂-powered trap capable of making multiple kills without manual resetting. While it has been extensively tested against rats, its effectiveness against much smaller mice had not been formally evaluated prior to this study. Researchers wanted to confirm that mice would be struck accurately and killed quickly — not injured or missed.
How the Study Was Conducted
Researchers captured 80 wild house mice and conducted controlled pen trials to evaluate:
- Time from trap impact to death (animal welfare performance)
- Bait type: peanut butter vs. Goodnature chocolate lure
- Trap orientation: vertical mounting vs. angled on a trap stand
Once humane performance was confirmed, larger arena trials were conducted where multiple mice were released together and exposed to either:
- Two A24 traps, or
- Two A24 traps plus two traditional snap traps
This allowed researchers to observe how traps performed under more realistic conditions with competition, multiple animals, and carcasses present.
Key Finding #1: A24 Traps Killed Mice Quickly and Humanely
Of the 80 mice tested in pen trials, 67 triggered the A24 trap and were killed. Only three mice required humane euthanasia after surviving beyond two minutes.
For the remaining mice, the average time from impact to death was approximately 51 seconds, meeting international animal welfare standards (NAWAC Class B) for kill traps. Most deaths occurred from skull or spinal trauma, indicating effective strike placement.
Importantly, there were no observed cases of mice being struck and escaping.
Key Finding #2: Peanut Butter Was Significantly More Effective Than Chocolate Lure
Bait selection had a major impact on performance:
- Peanut butter achieved a 98% mortality rate.
- Goodnature chocolate lure achieved a 70% mortality rate.
- Mice triggered peanut-butter-baited traps approximately 2.3 times faster.
Peanut butter is already widely used in rodent trapping and proved far more attractive to mice in these trials.
Key Finding #3: Angled Trap Placement Improved Trigger Speed
Trap positioning also influenced results. When A24 traps were mounted at an angle using a trap stand instead of vertically mounted:
- Mice triggered the trap approximately 2.7 times faster.
- Overall mortality rates remained high for both configurations.
The angled setup likely made it easier for mice to enter the trap and reach the trigger.
What Happened When Multiple Mice Were Present
In arena trials with five mice at a time and two A24 traps present:
- All 25 mice were killed by the A24 traps.
- Most kills occurred within the first 48 hours.
- Mice were not deterred by the presence of carcasses near the traps.
When snap traps were added alongside A24 traps:
- If snap traps were reset daily, they killed more mice.
- If snap traps were not reset, A24 traps killed more mice.
This highlights an important operational reality: snap traps require frequent servicing to remain effective, while A24 traps continue operating without manual resets.
What This Means for Property Owners and Land Managers
The study supports several practical conclusions:
- A24 traps are capable of killing house mice quickly and humanely.
- Peanut butter significantly improves trap effectiveness for mice.
- Angled placement increases how quickly mice engage the trap.
- A24 traps perform especially well where frequent servicing is difficult.
Snap traps may still be useful in environments where traps can be checked and reset daily. In remote, agricultural, or low-access locations, self-resetting traps reduce labor while maintaining high effectiveness.
Final Takeaway
This research confirms that the Goodnature A24 trap is not only effective against rats but can also serve as a reliable tool for controlling wild house mice when configured properly. Bait choice and mounting angle meaningfully impact performance, and humane kill standards were consistently met.
Future field trials will continue refining best practices, but current evidence strongly supports A24 traps as a viable mouse control solution.
Citation:
Shiels AB, Spock DR, Cochran T, Baeten L (2022). Efficacy testing of Goodnature A24 self-resetting rat traps for wild house mice (Mus musculus). Management of Biological Invasions 13 (in press).
