Verreaux’s eagles intersperse their flights with periods of perching, which can be detected by low values of acceleration. Eagles like to perch on rocky outcrops and are usually found together. Both perching and flying behaviours persist for periods of time, e.g. birds can perch for 10min between flights of 45min, and this is explicitly taken into account by virtue of the structure of HMMs. (© Megan Murgatroyd)

Verreaux’s eagles intersperse their flights with periods of perching, which can be detected by low values of acceleration. Eagles like to perch on rocky outcrops and are usually found together. Both perching and flying behaviours persist for periods of time, e.g. birds can perch for 10min between flights of 45min, and this is explicitly taken into account by virtue of the structure of HMMs. (© Megan Murgatroyd)