From what I know I imagine that Colchester are currently putting effort into trying to breed with the group they have presumably using A.I (maybe naturally as well). Also there is a Facebook post from 2 days ago showing Tanya, Opal, and Zola all outside together, normally it is Tanya and Opal in the cow paddock with Zola joining Tembo in the bull paddock, maybe this is evidence of someing being tried. Anyway this plan A would work if one or more females are successfully born between Tanya, Opal, and Zola, they would eventually be able to continue the herd to the next generation. Some of you may question the reproductive abilities of these females, and to that I say that the keepers know more about these Elephants than we do, and what will and won't work with them. In my mind, a plan B would feature two or three younger cows, maybe from Valencia, to join the existing herd (there would be room, especially if Zola stayed with Tembo) and breed with Tembo, to help re establish a breeding herd. I imagine Colchester Zoo would be able to get their way if they tried, because om the website it lists the curator as being co-chair BIAZA Elephant focus group. I will hopefully find out if my assumptions for the main plan of what they are currently trying to achieve is right when I next visit, but this is just a prediction from what I know already.