The shining wire is an animal-trapping device set by humans. It is made of a thin wire tied with a noose-like knot with an end fastened down securely. The one that the rabbits meet is a very thin copper wire with its end nailed to the ground.

During their visit to Cowslip's warren, Bigwig's neck gets caught in it and he is nearly strangled to death. He ends up with a small cut on his neck.

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