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Oryctolagus cuniculus
Oops, this link should be the one that works! http://www.projectnoah.org/missions/8475...
I am pretty sure this is a rabbit skull! I am guessing a little on the specific ID, but the the European Rabbit is very common in Portugal and Spain! Please consider adding this picture to the "Identifying Animals Through Osteology" Mission! http://www.projectnoah.org/missions/8475... Someone else may have an idea as well!