This is a distinctive skull in several ways, with an elevated cranium and pronounced temporal ridges. Perhaps the most interesting feature is the dentition, this fox uniquely (among foxes) possessing 48 teeth. The molars and carnassials are reduced in size and simplified compared to other canids, probably as an adaptation to a largely insectivorous diet.

1. Bat-eared Fox skull, lateral view
 
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Internet Resources

Bucknell University Mammal Checklist

References

Mammalian Species account