1. Internal and external factors modulate food-calling in domestic hens

   • A. M. Wauters
   • M. A. Richard-Yris
   • M. Foraste

   Original article Pages: 1 - 10

2. Error is proportional to distance measured by honeybees: Weber’s law in the odometer

   • K. Cheng
   • M. V. Srinivasan
   • S. W. Zhang

   Original article Pages: 11 - 16

3. Memory for action events in the bottlenosed dolphin

   • E. Mercado III.
   • Robert K. Uyeyama
   • Louis M. Herman

   Original article Pages: 17 - 25

4. Discrimination of multidimensional geometrical figures by chickens: categorization and pattern-learning

   • Christian W. Werner
   • G. Rehkämper

   Original article Pages: 27 - 40

5. Rule learning in rats: serial tracking in interleaved patterns

   • S. B. Fountain
   • James D. Rowan
   • Don M. Benson Jr.

   Original article Pages: 41 - 54

6. Object-goal positioning influences spatial representation in rats

   • R. G. Cook
   • T. L. Tauro

   Original article Pages: 55 - 62