What techniques do rats use to open a walnut? What are the traces they leave in nature?

I have a book on traces that wild animals leave in nature, but it only explains squirrels (splitting the walnut in two halves, using their teeth as a lever) and mice (gnawing a hole into the hull of the nut). I am interested in the two common European species of rats, brown rat (Rattus norvegicus) and black rats (Rattus rattus).

  • $\begingroup$ They don't use a nutcracker. $\endgroup$ Jan 31 at 21:56
  • $\begingroup$ Black or English walnuts ? there is a great difference when using a nutcracker. $\endgroup$ Feb 21 at 1:24
  • $\begingroup$ The usual walnuts grown in Europe, i,.e., Juglans regia $\endgroup$ Feb 21 at 12:28

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