. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 294 R. Arlettaz, A. Lugon, P. Médard & A. Sierro typical golden tips of hairs described in the literature. Since 1985, we have systematically recorded the coloration of the fur of Savi's bats we found. Informa- tion was gathered on 254 living individuals captured between 1985 and 1991. Unfor- tunately, these checks started independently in both areas, the French being unaware of the same activity by the Swiss people, and vice versa. For this reason, we did not a
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 294 R. Arlettaz, A. Lugon, P. Médard & A. Sierro typical golden tips of hairs described in the literature. Since 1985, we have systematically recorded the coloration of the fur of Savi's bats we found. Informa- tion was gathered on 254 living individuals captured between 1985 and 1991. Unfor- tunately, these checks started independently in both areas, the French being unaware of the same activity by the Swiss people, and vice versa. For this reason, we did not adopt immediately the same categories for the classification of fur coloration pat- terns. Nevertheless, the post hoc comparison of our categories on the basis of photographs and observations made during a visit by R. Arlettaz to Southern France, allowed us to group ah individuals in approximately similar Fig. 1: A typical Savi's bat with bicolor fur: back hair base is brown whereas tips are golden. Photograph by R. Arlettaz. Two main categories of fur coloration were defined: bicolor and unicolor (Table 1). A bicolor fur is the sole phenotype usually described in identification guides; this type of fur is characterized by a dark base of back hairs, with the tips much lighter in colour. The unicolor phenotype has hitherto only been mentioned by Médard & Guibert (1988) and Gebhard (1992, photograph p. 64). In this latter type back hairs do not present any contrast from the base towards tip. Both categories — bicolor and unicolor — were divided into subclasses. These subdivisions should be con- sidered with some caution. First, because they are more subjective to the apprecia- tion of the observer, and second because they attempt to group types within exclusive categories, while individuals actually show continuous clines in fur coloration. Bicolor was subdivided into three subclasses: brown hair base with golden tips; brown base with blond or beige ti
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