1. The number of males in primate social groups: a comparative test of the socioecological model

   • Charles L. Nunn

   REVIEW Pages: 1 - 13

2. Sperm economy and limitation in spiny lobsters

   • A. B. MacDiarmid
   • Mark J. Butler IV

   ORIGINAL ARTICLE Pages: 14 - 24

3. Two clinal trends in male-male aggressiveness in a subsocial spider mite (Schizotetranychus miscanthi)

   • Yutaka Saito
   • Ken Sahara

   ORIGINAL ARTICLE Pages: 25 - 29

4. Optimal timing of comb construction by honeybee (Apis mellifera) colonies: a dynamic programming model and experimental tests

   • Stephen C. Pratt

   ORIGINAL ARTICLE Pages: 30 - 42

5. Why do nocturnal orb-web spiders (Araneidae) search for light?

   • Astrid M. Heiling

   ORIGINAL ARTICLE Pages: 43 - 49

6. Frequency and timing of extrapair fertilisation in the polyandrous red phalarope (Phalaropus fulicarius)

   • James Dale
   • Robert Montgomerie
   • Peter Boag

   ORIGINAL ARTICLE Pages: 50 - 56

7. Male care and mating effort among Hadza foragers

   • Frank Marlowe

   ORIGINAL ARTICLE Pages: 57 - 64

8. Reduced take-off ability in robins (Erithacus rubecula) due to migratory fuel load

   • Johan Lind
   • Thord Fransson
   • Cecillia Kullberg

   ORIGINAL ARTICLE Pages: 65 - 70

9. Are attentive mothers preferentially parasitised?

   • Graeme D. Ruxton

   FORUM Pages: 71 - 72