I found an older book in my local library about the National Zoo and inside they had a section about the SCBI. They had photos of species that aren't there any more such as Bactrian Camels, Takins, and Sarus Cranes. It seems that the collection has downsized over time or that the zoo doesn't want to showcase other species that they hold? It'd be great to find out all the species that were held there previously and would be nice to attend the Conservation Discovery Day sometime to see some of the rarer species such as Eld's Deer and Hooded Cranes which are barely represented in the AZA.