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I haven't looked for mammals in Holland.

See Also
RFI Amsterdam, Prague and Singapore (Mar 2009).

Other People's trip reports
Double Dutch, 2011: Mark Hows, 3 days & 16 mammals including Bi-Coloured White-toothed Shrews and Root Voles.

Going Dutch, 2011: Mark Hows, 6 days & 18 mammals including Pond Bats and Common Hamsters.

Holland, Belgium and Germany, 2010: Mark Hows, 1 week & 22 mammals including Mouflon and Beech Marten.