 | Alyan, S. H. 2004. Conditions for landmark-based navigation in the house mouse, Mus musculus. Animal Behaviour 67: 171–175. |
 | Ame, J.-M., Rivault, C., Deneubourg, J.-L. 2004. Cockroach aggregation based on strain odour recognition. Animal Behaviour 68: 793–801. |
 | Amo, L., López, P., Martı́n, J. 2004. Wall lizards combine chemical and visual cues of ambush snake predators to avoid overestimating risk inside refuges. Animal Behaviour 67: 647–653. |
| Andel, D., Wehner, R. 2004. Path integration in desert ants, Cataglyphis: how to make a homing ant run away from home. Proceedings of the Royal Society of London. Series B: Biological Sciences 271: 1485–1489. |
| Anderson, J. R., Kuroshima, H., Kuwahata, H., Fujita, K. 2004. Do squirrel monkeys (Saimiri sciureus) and capuchin monkeys (Cebus apella) predict that looking leads to touching?. Animal Cognition 7: 185–192. |
| Anderson, J. R., Myowa–Yamakoshi, M., Matsuzawa, T. 2004. Contagious yawning in chimpanzees. Proceedings of the Royal Society of London. Series B: Biological Sciences 271: S468–S470. |
 | Avilés, J. M., Soler, J. J., Soler, M., Møller, A. P. 2004. Rejection of parasitic eggs in relation to egg appearance in magpies. Animal Behaviour 67: 951–958. |
| Barklow, W. E. 2004. Amphibious communication with sound in hippos, Hippopotamus amphibius. Animal Behaviour 68: 1125–1132. |
 | Barrett, L. 2004. Animal Innovation (Book review). Animal Behaviour 67: 993–994. |
| Barta, Z., Liker, A., Mónus, F. 2004. The effects of predation risk on the use of social foraging tactics. Animal Behaviour 67: 301–308. |
| Beckers, G. J. L., Nelson, B. S., Suthers, R. A. 2004. Vocal-tract filtering by lingual articulation in a parrot. Current Biology 14: 1592–1597. |
| Bednekoff, P. A., Lima, S. L. 2004. Risk allocation and competition in foraging groups: reversed effects of competition if group size varies under risk of predation. Proceedings of the Royal Society of London. Series B: Biological Sciences 271: 1491–1496. |
| Behr, O., von Helversen, O. 2004. Bat serenades—complex courtship songs of the sac-winged bat (Saccopteryx bilineata). Behavioral Ecology and Sociobiology 56: 106–115. |
| Beran, M. J. 2004. Long-term retention of the differential values of Arabic numerals by chimpanzees (Pan troglodytes). Animal Cognition 7: 86–92. |
| Bering, J. M. 2004. A critical review of the “enculturation hypothesis”: the effects of human rearing on great ape social cognition. Animal Cognition 7: 201–212. |
| Blumstein, D. T., Daniel, J. C. 2004. Yellow-bellied marmots discriminate between the alarm calls of individuals and are more responsive to calls from juveniles. Animal Behaviour 68: 1257–1265. |
| Blumstein, D. T., Verneyre, L., Daniel, J. C. 2004. Reliability and the adaptive utility of discrimination among alarm callers. Proceedings of the Royal Society of London. Series B: Biological Sciences 271: 1851–1857. |
| Bonadonna, F., Villafane, M., Bajzak, C., Jouventin, P. 2004. Recognition of burrow's olfactory signature in blue petrels, Halobaena caerulea: an efficient discrimination mechanism in the dark. Animal Behaviour 67: 893–898. |
| Bowne, D. R., White, H. R. 2004. Searching strategy of the painted turtle Chrysemys picta across spatial scales. Animal Behaviour 68: 1401–1409. |
| Bradley, B. J., Doran-Sheehy, D. M., Lukas, D., Boesch, C., Vigilant, L. 2004. Dispersed male networks in western gorillas. Current Biology 14: 510–513. |