may have an indicator not shown mounted to the housing 5 to provide external monitoring of the positioning of the trap an integral flange 21 extends laterally from the bottom of each side wall 9 to contact the ground and help stabilize and maintain the trap 1 in an upright position each flange 21 has two spaced apart attachment holes 23 for receiving a stake not shown that can be inserted into the ground to prevent the trap from sliding along the surface of the ground a barrel 25 mounted to the top wall 7 of the housing 5 extends up from the housing in a generally vertical position the barrel 25 has a tubular body 27 defining an explosion chamber 29 with the body having a lower end 31 extending through an opening in the top wall 7 of the housing 5 and a threaded upper end 35 a mounting flange 41 is spaced above the lower end 31 of that barrel 25 to connect the barrel to the top wall 7 of the housing 5 in the illustrated embodiment the mounting flange 41 is welded to the barrel body 27 and secured to the top wall 7 of the housing 5 via threaded fasteners 43 but it will be understood that other suitable forms of connection could be used e g rivets as shown in fig2 3 a and 5 the trap has an impingement device generally indicated at 51 at least partially housed in the enclosed space 15 the impingement device includes a thrust plate 53 generally parallel with the top wall 7 of the housing 5 and a plurality of sharpened pins 57 depending from the thrust plate 53 for penetrating the ground and impaling the mole a shaft 59 extends upward from the thrust plate.