Calling those things have-aheart is the worst misnomer since we called those bags of toxic gas, we mount on the steering wheel, air bags.
Anyone who has seen the abject terror in the eyes of an animal caught in one of those will agree with me.
If you have a problem with squirrels in your attic. Toss a box of moth balls up there. The squirrels will go away and so will the moths.
Snapping their little necks in a rat trap is far more humane than the so-called have-a-heart trap.
I usually carry a pocket full of peanuts and there is no problem.