Number Comprehension by a Grey Parrot (Psittacus erithacus), Including a Zero-Like Concept
A Grey parrot (Psittacus erithacus) that was able to quantify 6 item sets (including subsets of heterogeneous groups, e.g., blue blocks within groupings of blue and green blocks and balls) using English labels (I. M. Pepperberg, 1994a) was tested on comprehension of these labels, which is crucial for numerical competence (K. C. Fuson, 1988; see […]
Measuring behaviour accurately with instantaneous sampling: A new tool for selecting appropriate sampling intervals
A central dilemma in instantaneous sampling (IS) is to select appropriate sampling intervals for different behaviours. Ideally, the interval should be as long as possible without risking the accuracy of obtained estimates. In this study, we developed a computational method for evaluating the accuracy of IS estimates for behaviour durations and for selecting optimal interval […]
An automated positioning system for monitoring chickens’ location: Accuracy and registration success in a free-range area
Free-range use in chickens is often suboptimal, and the full potential of outdoor access for chicken welfare may not be achieved. Many studies use visual observations of free-range use, imposing several limitations. An automated system capable of continuously monitoring the location of multiple individual birds over a long time period has the potential to increase […]