Models of population dynamics generally neglect the presence of males. While this
assumption holds under many circumstances, behavioural ecology increasingly tells us that …

The ability in animals to count and represent different numbers of objects has received a
great deal of attention in the past few decades. Cumulative evidence from comparative …

We investigated whether jungle crows can select a given quantity of items (printouts of
shapes and symbols) when simultaneously presented with smaller or larger quantities. We …

Sexual harassment by males has been reported from several live-bearing fishes
(Poeciliidae) and has been shown to inflict costs on females. For example, poeciliid females …

The ability to quantify, ie to estimate quantity, may provide evolutionary advantages in some
contexts and has been demonstrated in a variety of animal species. In a prior study, we …

Behavior-modifying drugs, such as antidepressants, are increasingly being detected in
waterways and aquatic wildlife around the globe. Typically, behavioral effects of these …

Diazepam (DZP) residue has been frequently detected in wastewater, surface water, and
groundwater due to its extensive use over the decades. In this study, we exposed female …

The capacity of pharmaceutical pollution to alter behaviour in wildlife is of increasing
environmental concern. A major pathway of these pollutants into the environment is the …

The relationship between an individual's cognitive abilities and other behavioural attributes
is complex, yet critical to understanding how individual differences in cognition arise. Here …

Operational sex ratio (the ratio of sexually active males to fertilizable females) has a major
influence on male competition for mates and male–female interactions. The contributions of …