Still no sign of breeding with this pair then? I believe they may be related, or the male is infertile- or both! Unless Edinburgh have a new adult male, the one here is the only one in the UK. I think this photo is the female- more delicate and less colourful head.
I know this male is very nervous. But they are much easier to photograph/see properly since they were moved out of the cage in the Quarantine House (near the Siamang cages) and into this one.
