Table 1.

Modifications of the group composition and the sex-ratio over time

Notes: Diamonds represent males, and circles females. Asterisks indicate new individuals added into the group. In 2012, the group composition had been stable since 2010. In April and June 2013, two individuals escaped after rodents damaged the aviary (h, male; y female); in October 2013, six new individuals were added to the group (a, juvenile male; c, g, p, s, w, females), one of which escaped a few days afterwards and thus do not appear in the table (w, female). Finally, two other birds died of natural causes in May and August 2014 (z, male; c, female).