Bit concerned after my visit today. The Sumatran orangs were in the window area, so there was amazing view of them ( a rare occurance in my visits!) However, one of the adults vomited on the window sill and immediately re-ate it, directly in front of the public, ( who of cause screamed.) Surely that isn't the behaviour of a happy / healthy animal? Or do orangs do that kind of thing? Rare to see something like that at Chester.