1. Differences in performance on a reversal learning test and division of labor in honey bee colonies

   • Y. Ben-Shahar
   • C. K. Thompson
   • G. E. Robinson

   Original article Pages: 119 - 125

2. Erroneous choice and foregone gains in hoarding gray jays (Perisoreus canadensis)

   • T. A. Waite
   • K. L. Field

   Original article Pages: 127 - 134

3. Domestic hens have declarative representations

   • B. Forkman

   Original article Pages: 135 - 137

4. Learning and foraging efficiency in German cockroaches, Blattella germanica (L.) (Insecta: Dictyoptera)

   • V. Durier
   • C. Rivault

   Original article Pages: 139 - 145

5. Seeing how it’s done: matching conditions for observer rats (Rattus norvegicus) in the bidirectional control

   • E. D. Ray
   • M. R. Gardner
   • C. M. Heyes

   Original article Pages: 147 - 157

6. Intentional behaviour in dog-human communication: an experimental analysis of “showing” behaviour in the dog

   • A’. Miklósi
   • R. Polgárdi
   • V. Csányi

   Original article Pages: 159 - 166