That's a tough one! From the bill, legs, and tail, I would say that this is a species of thrush or babbler. I'm not sure which one, but they have Snowy-crowned Robin-Chat in their collection so maybe a juvenile of that species. They also have Scarlet-faced Liocichla, so possibly a juvenile of that species. This species seems to have a little orange or rufous-red on or under its tail. The robin-chat has an orange tail and the liocichla has an orangish-color to the underside of its tail. The juvenile robin-chats have a dark back and head, so I lean toward that species.