Table 1.
Mouse and rat traps selected for the replicated set, and their features. A) mouse traps; B) rat traps.
Figure 1.
Impact momentum against clamping force for mouse and rat traps.
Mouse trap types (n = 23) are represented by circles and rat trap types (n = 17) by triangles or squares. Each point represents a different trap type and is the mean of five measurements on one trap. [The raw data from which these were calculated are shown in Figure S6.] Points marked Ma-f (labelled blue) and Ra-f (labelled red) are trap types in the mouse and rat replicated sets respectively, with features shown in Table 1.
Figure 2.
Raw data for impact momentum against clamping force in mouse and rat trap replicated sets.
A) mouse trap types; B) rat trap types. Each point represents an individual trap and traps of the same type are enclosed within a polygon. These trap types are identified on Figure 1. For scale, the small square, demarcated by the dotted lines and the axes on Figure 2B, represents the entire range of clamping forces and impact momentums shown by Figure 2A.
Table 2.
Mean values and standard errors of impact momentum (Ns) among rat trap types*.
Table 3.
Mean values and standard errors of clamping force (N) among rat trap types*.
Table 4.
Mean values and standard errors of impact momentum (Ns) among mouse trap types*.
Table 5.
Mean values and standard errors of clamping force (N) among mouse trap types*.
Figure 3.
Impact momentum against clamping force for mole traps.
Each point represents a different trap type/manufacturer combination and is the mean of measurements on 10 individual traps for impact momentum and 20 traps for clamping force. Points for traps of the same type but from different manufacturers are enclosed within a polygon. Points marked Da-e represent Duffus traps (n = 5), those marked Sa-e represent scissors traps (n = 5) and those marked Ta,c,e,f represent talpa-style traps (n = 4). Letters a-f represent different manufacturers.
Figure 4.
Raw data for impact momentum against clamping force in mole traps.
Each point represents an individual trap and traps of the same trap type/manufacturer combination are enclosed within the same polygon. Trap types are: blue = Duffus, red = scissors, black = talpa.
Table 6.
Mean, standard error, minimum and maximum prices paid for mole trap types.
Figure 5.
Price against mean mole trap performance.
A) impact momentum; B) clamping force. Each point represents a trap type/manufacturer combination. Points for each trap type are enclosed in a polygon. There was a linear relationship between clamping force and price for talpa traps but no evidence for such a relationship for other trap types. There was no evidence of a linear relationship between impact momentum and price for any trap type.
Table 7.
Welfare Categories proposed in FERA’s recent review of trapping standards (Talling and Inglis 2009).