Over the last 20 years, a large amount of research has been conducted in an attempt to
uncover the cognitive abilities of the domestic dog. While substantial advancements have …

A large body of experimental evidence shows that animals as diverse as mammals, birds,
and fish are capable of processing numerical information. Considerable differences have …

Visual illusions are objects that are made up of elements that are arranged in such a way as
to result in erroneous perception of the objects' physical properties. Visual illusions are used …

In a variety of circumstances animals can represent numerical values per se, although it is
unclear how salient numbers are relative to non-numerical properties. The question is then …

Numerous studies have reported that animals reliably discriminate quantities of more or less
food. However, little attention has been given to the relative salience of numerosity …

Playback experiments have proved to be a useful tool to investigate the extent to which wild
animals understand numerical concepts and the factors that play into their decisions to …

A longstanding question in comparative psychology is whether animals can use quantitative
information to guide behavior in ways similar to how humans use that information. The …

We examined spontaneous quantity discrimination in untrained domestic cats in three food
choice experiments. In Experiment 1, we presented the cats with two different quantities of …

In the last decade, visual illusions have been repeatedly used as a tool to compare visual
perception among species. Several studies have investigated whether non-human primates …

The ability to represent approximate quantities appears to be phylogenetically widespread,
but the selective pressures and proximate mechanisms favouring this ability remain …