You need to be afraid, Very Afraid! They are like the little snap traps but about 1 foot long and 6 inches wide. They will break fingers and hands like it was nothing.What is a wharf rat trap? A spring mouse trap on steroids? If so I am afraid my chickens would get in it.
You would need to keep your birds put up till it kills all the rodents and you remove the trap. They often have chains that you picket down so if you catch a coon and it doesn't kill, they can't take off with your trap.
I've heard for them being used to catch mink, martens,and weasels also.
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