1. Natural History Museum, University of Pisa Via Roma, 79, CALCI 56011 Pisa Italy
2. CNR, Institute of Cognitive Sciences and Technologies Via Aldrovandi 16b 00197 Rome Italy
3. Department of Psychology University of Tennessee 1404 Circle Drive Knoxville TN 37996‐0900 U.S.A.
4. Department of Ecology & Evolutionary Biology University of Tennessee 1404 Circle Drive Knoxville TN 37996‐0900 U.S.A.
5. Department of Psychology University of Michigan 530 Church St. Ann Arbor MI 48109‐1043 U.S.A.
6. Department of Child and Family Studies University of Tennessee 1215 Cumberland Avenue 422 Knoxville TN 37996–1912 U.S.A.
7. Tarsius o.s. Na Pěšině 267 Děčín 40505 Czech Republic
8. Department of Psychology Gettysburg College 300 North Washington St. Gettysburg PA 17325‐1400 U.S.A.
9. Department of Neuroscience University of Lethbridge 4401 University Drive Lethbridge Alberta T1K 3M4 Canada