Seasonal changes in group size and composition of Arabian sand gazelle Gazella subgutturosa marica Thomas, 1897 during a period of drought in central western Saudi Arabia
Peter Low CUNNINGHAM, Torsten WRONSKI

Insights into social relationships among female black howler monkeys Alouatta pigra at Palenque National Park, Mexico
Sarie VAN BELLE, Alejandro ESTRADA, AND Karen B. STRIER

Land use in semi-free ranging Tonkean macaques Macaca tonkeana depends on environmental conditions: A geographical information system approach
Cédric SUEUR, Paul SALZE, Christiane WEBER,Odile PETIT

The duration of sociosexual behaviors in male meadow voles Microtus pennsylvanicus varies before, during, and after copulation
Ashlee A. VAUGHN, Daniel A. FERKIN, Javier delBARCO-TRILLO, Michael H. FERKIN

Telomeres: Linking stress and survival, ecology and evolution
Mark F. HAUSSMANN, Nicole M. MARCHETTO

Frog community responses to recent American bullfrog invasions
Yiming LI, Zhunwei KE, Yihua WANG, Tim M. BLACKBURN

Karyological and morphometric variation of the North African green frog Pelophylax saharicus (Anura) in north-eastern Africa
Nabil AMOR, Sarra FARJALLAH, Slim BEN-YACOUB, Khaled SAID

Demography and dynamics of mountain nyala Tragelaphus buxtoni population in the Bale Mountains National Park, Ethiopia
Yosef MAMO, Michelle A. PINARD, Afework BEKELE

On the intraspecific variability in basal metabolism and the food habits
F. BOZINOVIC, P. SABAT

Spatial and temporal variation of fish assemblages in a subtropical small stream of the Huangshan Mountain
Yunzhi YAN, Ling CHU, Xiuying XIANG, Yanju JIA, Juan TAO, Yifeng CHEN

Sources and significance of variation in basal, summit and maximal metabolic rates in birds
Andrew E. MCKECHNIE, David L. SWANSON

Leaf choice by black-and-white snub-nosed monkeys Rhinopithecus bieti is related to physical and chemical properties
Zhipang HUANG, Sheng HUO, Shuguo YANG, Liangwei CUI Wen XIAO

Application of heat shock protein expression for detecting natural adaptation and exposure to stress in natural populations
Jesper Givskov SØRENSEN

Redox physiology in animal function: The struggle of living in an oxidant environment
David COSTANTINI