1. Functional referents and acoustic similarity revisited: the case of Barbary macaque alarm calls

   • Julia Fischer
   • Kurt Hammerschmidt

   Original Article Pages: 29 - 35

2. Gaze discrimination learning in olive baboons (Papio anubis)

   • Sarah-Jane Vick
   • Dalila Bovet
   • James R. Anderson

   Original Article Pages: 1 - 10

3. Cognitive capacities for behavioural flexibility in wild chimpanzees (Pan troglodytes): the effect of snare injury on complex manual food processing

   • Emma J. Stokes
   • Richard W. Byrne

   Original Article Pages: 11 - 28

4. Categorization of multidimensional geometrical figures by chickens (Gallus gallus f. domestica): fit of basic assumptions from exemplar, feature and prototype theory

   • Christian W. Werner
   • Gerd Rehkämper

   Original Article Pages: 37 - 48

5. Spatial learning in turtles

   • J. López
   • Y. Gómez
   • C. Salas

   Original Article Pages: 49 - 59

6. Transitive choices by a simple, fully connected, backpropagation neural network: implications for the comparative study of transitive inference.

   • C. De Lillo
   • D. Floreano
   • F. Antinucci

   Original Article Pages: 61 - 68