Fascinating stuff about the hares, there seems to be a lack of information about Mallorca's mammal species in general, I found another article stating that Pine Martens are extinct here which is evidently not true either!
Given the number of road kills one sees, they may be becoming extinct.
If it's of interest, here's a list of mammals (from Fauna Europaea, ignoring subspecies):
Atelerix algirus (Lereboullet 1842)
Lepus granatensis Rosenhauer 1856
Oryctolagus cuniculus (Linnaeus 1758)
Tadarida teniotis (Rafinesque 1814)
Apodemus sylvaticus (Linnaeus 1758)
Mus domesticus Schwartz & Schwartz 1943
Mus spretus Lataste 1883
Rattus norvegicus (Berkenhout 1769)
Rattus rattus (Linnaeus 1758)
Martes martes (Linnaeus 1758)
Mustela nivalis (Linnaeus 1766)
Eliomys quercinus (Linnaeus 1766)
Rhinolophus ferrumequinum (Schreber 1774)
Rhinolophus hipposideros (Bechstein 1800)
Crocidura russula (Hermann 1780)
Crocidura suaveolens (Pallas 1811)
Barbastella barbastellus (Schreber 1774)
Eptesicus serotinus (Schreber 1774)
Hypsugo savii (Bonaparte 1837)
Miniopterus schreibersii (Kuhl 1817)
Myotis capaccinii (Bonaparte 1837)
Myotis emarginatus (E. Geoffroy 1806)
Myotis myotis (Borkhausen 1797)
Myotis nattereri (Kuhl 1817)
Pipistrellus kuhlii (Kuhl 1817)
Pipistrellus pipistrellus (Schreber 1774)
Plecotus austriacus (Fischer 1829)
Genetta genetta (Linnaeus 1758)
Martin