Effect of Tank Size on Zebrafish Behavior and Physiology.

Environmental conditions strongly affect experimental animals. As a model organism, zebrafish has become important in life science studies. However, the potential effect of living environment on their behavior and physiology is often overlooked.

Azure-winged magpies solve string-pulling tasks by partial understanding of the physical cognition.

String-pulling is one of the most widely used paradigms in animal cognition research. We investigated how azure-winged magpies solve multiple-string problems that they have never encountered before. In Experiment 1, the strings were arranged in parallel, slanted, or crossed to investigate what rules azure-winged magpies use to solve multiple spatial relations of strings.