Somewhere in the deep waters off Dominica, a female sperm whale fires a rapid burst of clicks toward her companions. The ...

The sound is sharp, spare and strange, a burst of clicks cutting through seawater. For years, researchers treated those sperm ...

A new study of geladas – a species of monkey living in the highlands of Ethiopia – has revealed that their long and complex vocal sequences follow a pattern seen in many human languages: the longer ...

An example of a linear sequence. A list of numbers or diagrams that are in a particular order is called a sequence close sequenceA sequence is a set of numbers that follow a certain rule. For example, ...