Captive environment may lead to unintentional changes in animals. These changes may be unintentional and alter thresholds for performing behaviours essential for survival in the wild (Kleiman 1989)   From an ex situ breeding aspect, release animals should have a behavioural repertoire as close as possible to that of their wild conspecifics. Therefore, it is of great importance that animals are as little affected as possible by their captivity. However, it is not possible to completely avoid changes. Wild animals are likely to adapt to captive environment rapidly through unintentional natural selection (Gilligan & Frankham 2003).

From this aspect, I have investigated the differences between two captive populations of red jungle fowl (Gallus gallus) (RJF) and one of White Leghorn layers (Gallus gallus domesticus) (WL), focusing on social behaviours.