1. Maternal investment in rhesus macaques (Macaca mulatta): reproductive costs and consequences of raising sons

   • F. B. Bercovitch
   • Anja Widdig
   • Peter Nürnberg

   Original Article Pages: 1 - 11

2. Reproductive success of monogamous and polygynous pied flycatchers (Ficedula hypoleuca)

   • T. Lubjuhn
   • Wolfgang Winkel
   • Jörg Brün

   Original Article Pages: 12 - 17

3. Group histories and offspring sex ratios in ringtailed lemurs (Lemur catta)

   • C. L. Nunn
   • Michael E. Pereira

   Original Article Pages: 18 - 28

4. Adaptive host choice and avoidance of superparasitism in the spawning decisions of bitterling (Rhodeus sericeus)

   • C. Smith
   • John D. Reynolds
   • Pavel Jurajda

   Original Article Pages: 29 - 35

5. Color choices by bumble bees (Bombus terrestris): innate preferences and generalization after learning

   • A. Gumbert

   Original Article Pages: 36 - 43

6. Male greenfinches (Carduelis chloris) with brighter ornaments have higher virus infection clearance rate

   • K. Lindström
   • Jan Lundström

   Original Article Pages: 44 - 51

7. Parental investment, adult sex ratios, and sexual selection in a socially monogamous seabird

   • Bernie R. Tershy
   • Donald A. Croll

   Original Article Pages: 52 - 60

8. Spatial and behavioral interactions between a native and introduced salamander species

   • L. J. Rissler
   • Amy M. Barber
   • A. M. Baker

   Original Article Pages: 61 - 68

9. Evolution of male mating behavior: male spadefoot toads preferentially associate with conspecific males

   • K. S. Pfennig
   • Katrina Rapa
   • Regan McNatt

   Original Article Pages: 69 - 74

10. Weight comparisons and litter size manipulation in Columbian ground squirrels (Spermophilus columbianus) show evidence of costs of reproduction

    • P. Neuhaus

    Original Article Pages: 75 - 83

11. Molecular genetic and behavioral analysis of social organization in the Asian elephant (Elephas maximus)

    • P. Fernando
    • Russell Lande

    Original Article Pages: 84 - 91