Non-invasive techniques for analysing hormonal indicators of stress.

The growing concern over animal welfare has led to an increased awareness of the need to monitor and reduce stress in laboratory, zoo, and farm animals. To do so, valid and reliable methods are necessary. In the present work, we discuss non-invasive techniques for analysing hormonal indicators of stress, particularly glucocorticoids.

Degree of social contact affects the emission of food calls in the common marmoset (Callithrix jacchus).

The aim of this study was to investigate whether the emission of food calls in common marmosets (Callithrix jacchus) is influenced by different social contexts. Food calls are emitted by this species only in the presence of preferred food. If these calls have any communicative function, it may be that individuals produce food calls in order to call family mates toward the food source.